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	<title>snakes &#8211; Greg Laden&#039;s Blog</title>
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		<title>Venomous: How the Earth&#8217;s Deadliest Creatures Mastered Biochemistry</title>
		<link>https://gregladen.com/blog/2016/07/15/venomous-how-the-earths-deadliest-creatures-mastered-biochemistry-2/</link>
					<comments>https://gregladen.com/blog/2016/07/15/venomous-how-the-earths-deadliest-creatures-mastered-biochemistry-2/#comments</comments>
		
		<dc:creator><![CDATA[Greg Laden]]></dc:creator>
		<pubDate>Fri, 15 Jul 2016 22:23:15 +0000</pubDate>
				<category><![CDATA[Book review]]></category>
		<category><![CDATA[Books]]></category>
		<category><![CDATA[Christie Wilcox]]></category>
		<category><![CDATA[Evolution]]></category>
		<category><![CDATA[evolution]]></category>
		<category><![CDATA[Human Evolution]]></category>
		<category><![CDATA[snakes]]></category>
		<category><![CDATA[Venom]]></category>
		<category><![CDATA[Venomous]]></category>
		<guid isPermaLink="false">http://scienceblogs.com/gregladen/?p=22705</guid>

					<description><![CDATA[You can read this book review, or you can just go HERE and listen to our interview with author Christie Wilcox. I promise you in advance that you will want to read her book! But, if you want to read the book review, here it is&#8230; Did you ever do anything that hurt, then you &#8230; <a href="https://gregladen.com/blog/2016/07/15/venomous-how-the-earths-deadliest-creatures-mastered-biochemistry-2/" class="more-link">Continue reading <span class="screen-reader-text">Venomous: How the Earth&#8217;s Deadliest Creatures Mastered Biochemistry</span> <span class="meta-nav">&#8594;</span></a>]]></description>
										<content:encoded><![CDATA[<p><em>You can read this book review, or you can <a href="http://ikonokast.com/2016/07/15/christie-wilcox-venomous-creatures/" target="_blank">just go HERE and listen to our interview with author Christie Wilcox</a>.  I promise you in advance that you will want to read her book!</p>
<p>But, if you want to read the book review, here it is&#8230;<br />
</em></p>
<p>Did you ever do anything that hurt, then you had to do it again and you knew it would still hurt, and you didn&#8217;t like that? Like getting your teeth cleaned, or licking a nine volt battery. OK, maybe you didn&#8217;t <em>have</em> to lick the nine volt battery, but you get my point.</p>
<p>When I was working in the Ituri Forest, in the Congo, taking a walk in the forest was one of those things. All sorts of things hurt. Your feet hurt because of jungle rot combined with sandy gritty stuff permanently indurated in your shoes.  The leaves and branches you would have to move through hurt because it was early in the morning and they were cold and wet.  And so on.</p>
<p>But one of the things that was not inevitable, but nearly daily, was being stung by a venomous beast of some kind. The most serious threat, of course, was snakes but that never happened to me. Much more common, but more common a night, was to be bitten or stung by a venomous ant.  But that only happened, maybe, once a week or so.  But nearly every day, if I would walk far enough in the forest (hundreds of meters) especially early in the morning, would be the venomous caterpillars.</p>
<p>Cute little caterpillars with some extra long furry thingies sticking out of them. When you brush against them, there is instant local pain, a bit like a bee sting (but different) followed quickly by shooting pains from the site of contact to the nearest major lymph node (usually the arm pit), followed by pain in the lymph node. The pain would eventually go away, after minutes, sometimes a bit longer.  Most gentile urbane suburban or urban dwelling Americans and Europeans can go for years between envenomations.  But if you are a human, or some other creature, living in certain environments, the risk of envenomation is not only constant, but the actual smaller scale, not deadly, envenomation events are a regular occurrence, and the threat of The Big One (such as a Black Mamba bite or a Cobra strike) is always there.</p>
<p>In <a  href="https://www.amazon.com/gp/product/0374283370/ref=as_li_tl?ie=UTF8&#038;camp=1789&#038;creative=9325&#038;creativeASIN=0374283370&#038;linkCode=as2&#038;tag=grlasbl0a-20&#038;linkId=f1b803d499b6578247b2f3cf6960aafa">Venomous: How Earth&#8217;s Deadliest Creatures Mastered Biochemistry</a><img decoding="async" src="//ir-na.amazon-adsystem.com/e/ir?t=grlasbl0a-20&#038;l=am2&#038;o=1&#038;a=0374283370" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" />, Chritie Wilcox explains why this is important.  We tend to think of the interaction between animals, within or between species &#8212; those interactions that have to do with sexual competition, feeding, or predator avoidance &#8212; as involving tooth, nail, squiggly appendages, and all that. But these interactions also involve, very often, some sort of envenomation.  Also, using venom isn&#8217;t always about stinging, paralyzing, or killing. Mosquitos use venom to make blood sucking possible, as the chemicals used to stop their host from feeling the bite, and to make it easier to suck the blood, etc., are venoms.  Indeed, the parasites we know to be so commonly associated with mosquitos get into the host by hanging out with the venom, free riding with the injected biochemicals.</p>
<p>So, the evolution and diversification of venom and strategies of attack or defense, and other things, associated with venom co-evolved with anti-strategies to avoid the pain, paralysis, to avoid the bite or sting or brush of the venomous hair of the caterpillar.  Indeed, understanding the evolutionary history and patterns of adaptation associated with the use of venom is just as good as any syndrome of interaction or behavior for the study of how evolution itself works.</p>
<p><a  href="https://www.amazon.com/gp/product/0374283370/ref=as_li_tl?ie=UTF8&#038;camp=1789&#038;creative=9325&#038;creativeASIN=0374283370&#038;linkCode=as2&#038;tag=grlasbl0a-20&#038;linkId=dc188f75defaa41ea47e0ebc4244f95e">Christie Wilcox&#8217;s book</a><img decoding="async" src="//ir-na.amazon-adsystem.com/e/ir?t=grlasbl0a-20&#038;l=am2&#038;o=1&#038;a=0374283370" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" /> is one of the better science books I&#8217;ve read in some time.  This is an area I should know something about, as a biological scientist, and as a person who has lived for years in the venom-rich rain forest.  But I still found myself learning something new with every page turn.  Wilcox has studied venom for years &#8212; this is her area of specialty &#8212; and her text is enriched with well placed and well told stories of her own sometimes harrowing experiences.</p>
<p>The book is very well written and very well documented with copious notes.</p>
<p>A fascinating subtext has to do with human evolution and experience.  There is a theory that primates generally are tuned to venomous creatures, especially snakes, and some of the key primate evolutionary adaptations are shaped by the experience of living in trees where large venomous snakes hunt.  In the present day, there is what looks to me almost like a cult of self envenomation, found among people who keep venomous snakes (mainly), who inject themselves with venom regularly in order to stay, maybe, immune in case of an accidental bite. But they seem to be doing something more than this, almost using the venom as a sort of drug or, fascinatingly, as an elixir to extend life.  On top of this, there is even an expanding practice of using snake bites, or ingesting the powdered form of snake venom, as a recreational drug.  This set of not too unrelated human stories sits intriguingly amid myriad stories of venom use among a wide range of animals, including several mammals, fish, cone snails, snakes and lizards, etc.</p>
<p>I get the impression that bad scientific knowledge (generally older), folk stories, and meemish yammering about venom is among the most widespread form of falsehood in our parascientific discourse.  As I read this book, I remembered may instances of hearing or reading this or that thing about this or that venomous animal, or category of animal, that turned out wrong as more recent science exposed what was really happening. For many years, scientists were not sure if the platypus was venomous (it is) or why (it is all about sex for them). How does the Komodo Dragon kill large prey such as the Water Buffalo? If you look it up, you may find out that the Komodo Dragon maintains a bacterial flora in its mouth that causes necrosis in a bite victim. That is not true. Read Christie Wilcox&#8217;s book to find out the real story! And so on.</p>
<p><a  href="https://www.amazon.com/gp/product/0374283370/ref=as_li_tl?ie=UTF8&#038;camp=1789&#038;creative=9325&#038;creativeASIN=0374283370&#038;linkCode=as2&#038;tag=grlasbl0a-20&#038;linkId=47701c575fc20646d8e7d56d436cc724">Venomous: How Earth&#8217;s Deadliest Creatures Mastered Biochemistry</a><img decoding="async" src="//ir-na.amazon-adsystem.com/e/ir?t=grlasbl0a-20&#038;l=am2&#038;o=1&#038;a=0374283370" width="1" height="1" border="0" alt="" style="border:none !important; margin:0px !important;" /> is out in August, but available for pre order.</p>
<p>Mike Haubrich and I interviewed Christie on the Ikonokast podcast, and it turns out to have been a fantastic interview.  <a href="http://ikonokast.com/2016/07/15/christie-wilcox-venomous-creatures/" target="_blank">Listen to it here!</a></p>
<p>Christie Wilcox <a href="http://blogs.discovermagazine.com/science-sushi/">blogs at Science Sushi</a>.</p>
]]></content:encoded>
					
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		<post-id xmlns="com-wordpress:feed-additions:1">22705</post-id>	</item>
		<item>
		<title>What is your comfort zone?</title>
		<link>https://gregladen.com/blog/2011/04/13/what-is-your-comfort-zone/</link>
					<comments>https://gregladen.com/blog/2011/04/13/what-is-your-comfort-zone/#comments</comments>
		
		<dc:creator><![CDATA[Greg Laden]]></dc:creator>
		<pubDate>Wed, 13 Apr 2011 17:07:35 +0000</pubDate>
				<category><![CDATA[adaptation]]></category>
		<category><![CDATA[Anthropology]]></category>
		<category><![CDATA[Archaeology]]></category>
		<category><![CDATA[Fishing]]></category>
		<category><![CDATA[heat wave]]></category>
		<category><![CDATA[ice fishing]]></category>
		<category><![CDATA[lost congo memoir]]></category>
		<category><![CDATA[pygmies]]></category>
		<category><![CDATA[snakes]]></category>
		<guid isPermaLink="false">http://scienceblogs.com/gregladen/2011/04/13/what-is-your-comfort-zone/</guid>

					<description><![CDATA[Today, I took out the trash. I may or may not have taken the trash out last week, but I can tell you that the last time I did take it out, whenever it was, I had to drag the trash barrel across ice. Yesterday I went to the gym without a coat or jacket. &#8230; <a href="https://gregladen.com/blog/2011/04/13/what-is-your-comfort-zone/" class="more-link">Continue reading <span class="screen-reader-text">What is your comfort zone?</span> <span class="meta-nav">&#8594;</span></a>]]></description>
										<content:encoded><![CDATA[<p>Today, I took out the trash.  I may or may not have taken the trash out last week, but I can tell you that the last time I did take it out, whenever it was, I had to drag the trash barrel across ice.  Yesterday I went to the gym without a coat or jacket.  That made me have to decide if I wanted to go to the locker room to stow the contents of my pockets (car keys, etc.) or just keep those things in my pocket.  The grass outside is green.  We expect snow on Friday.<br />
<span id="more-25028"></span><br />
Where I grew up, in what is now known among gardeners and cooperative extension agents as Zone 5b (though a short drive from a Zone 4b) everyone knows that in the Spring, crocus spring forth first, then daffodils, then, third, tulips.  Where I live now, the people here think they all pop out of the ground at the same time.  In fact, they do, springing from just-thawed earth within a few minutes of each other a few days after the last snow melts (there may be some snow left in fact) and a few days before it becomes unbearably hot.</p>
<p><em>Cooperative Extension Agent:</em></p>
<p><iframe title="YouTube video player" width="480" height="390" src="https://www.youtube.com/embed/5ZtL7sSZqhs" frameborder="0" allowfullscreen></iframe></p>
<p>Of course, it never really gets unbearably hot here.  Again, I can make the comparison:  A heat wave where I grew up is when the temperature hits 100 or more during the hottest hour of the afternoon and the nights do not cool off much.  Here, where I live now, a heat wave is where it hits 90 or more every day but it will still go to 70 or sometimes below during the coolest part of the night.  People in Chicago and New York will complain about their heat wave to about the same degree as people in central and northern Minnesota will complain about their heat wave, but there is a difference.  People in Chicago and New York die during their heat waves.  Not all of them, but some of them.</p>
<p><em>Heat Wave:</em></p>
<p><iframe title="YouTube video player" width="480" height="390" src="https://www.youtube.com/embed/XE2fnYpwrng" frameborder="0" allowfullscreen></iframe></p>
<p>Of course, people in northern Minnesota die by falling through the ice more often than people in New York or Chicago do.</p>
<p><em>Typical Day On the Ice:</em></p>
<p><iframe loading="lazy" title="YouTube video player" width="480" height="390" src="https://www.youtube.com/embed/3QnfxMNaNuU" frameborder="0" allowfullscreen></iframe></p>
<p>My feet can be wet, and even muddy and sandy inside my shoes and I don&#8217;t care.  Glynn Isaac could not stand wet feet.  He grew up in arid country (South Africa and Kenya) while I grew up spending time in a temperate moist forest (the Adirondacks).  Had this not been true, I would have never done my PhD on what I did it on. Glynn wanted to work in the Ituri Forest but what he ended up doing is sending his only student who did not care about wet feet.  You would be surprised as to how many archaeologists ended up specializing in one area or another because of something utterly tangential to archaeology.  Jack Harris studied the Karari Industry because he could back up a truck with a trailer on it. Lew Binford got into archaeology at all because he had time off while a soldier in Korea and ended up bumping into interesting tombs.  J. Desmond Clark took an interest in Africa (and, essentially, founded and shaped African Archaeology) for similar reasons; He was assigned to positions with trenches, dug across interesting stratigraphy, while with the British Army in North Africa.</p>
<p><em>Archaeology:</em></p>
<p><iframe loading="lazy" title="YouTube video player" width="480" height="390" src="https://www.youtube.com/embed/yi1kMSHmD8g" frameborder="0" allowfullscreen></iframe></p>
<p>I once new a graduate student in anthropology who went into graduate school to study a particular system.  She was very excited about this system because it had to do with genes, and genes were (here words&#8230;) &#8220;The Truth&#8221; as opposed to, I guess, bones and stuff.  That system didn&#8217;t work out.  She tried another one.  Didn&#8217;t work out.  She tried a different one.  Didn&#8217;t work out.  Finally she discovered an interest in monkeys.  Monkeys have genes, interesting ones, and that worked out.  Funny how &#8220;The Truth&#8221; can be such a problem.</p>
<p><em>Interesting Monkey:</em></p>
<p><iframe loading="lazy" title="YouTube video player" width="560" height="349" src="https://www.youtube.com/embed/5_sfnQDr1-o" frameborder="0" allowfullscreen></iframe></p>
<p>I can&#8217;t remember the first time I was ever in a house with air conditioning, but it might have been when I was 13 and my parents moved to a place with an air conditioner.  It was not on all the time and it kept the downstairs absurdly cold if the upstairs was cooled at all, so it had little effect on me (living in an uninsulated room over the garage extension and all).  My wife, my daughter, my son, lots of people in my wife&#8217;s family, others that I know these days all grew up in houses with air conditioning.  When my daughter was growing up she did not like wearing coats or sweaters.  Her mother always wanted her to do so, because she, the mother, was always cold.  Same old story, you&#8217;ve heard it before.  &#8220;I&#8217;m cold, put on a sweater!&#8221;  I conspired with Julia often so she did not have to wear the uncomfortably warm clothing.  So, even though she grew up with air conditioning, she grew accustom to cold.  So one end of her range of comfort is more open ended than the other. She is skinny and lanky but the heat bothers her.  An Inuit trapped in the body of a Maasai warrior.</p>
<p><em>Air Conditioning:</em></p>
<p><iframe loading="lazy" title="YouTube video player" width="480" height="390" src="https://www.youtube.com/embed/zR9CA8lJGvs" frameborder="0" allowfullscreen></iframe></p>
<p>Speaking of Inuit, a friend of mine is an Aleutian (they historically live on the same end of the planet) and while he grew up in a run of the mill middle class home on a reservation, the home was in Alaska and he spent a fair amount of time on boats in the Bering Sea and on land doing archaeology and stuff on the edge of the Arctic Circle.  Then he went to live with reindeer herders in Siberia (the Eveny or Evenki, not the SÃ¡mi).  I thought it was funny when the first thing he said to me when he returned after his first season of working with them as an anthropologist was this:  &#8220;I can&#8217;t believe how COLD it is there!&#8221;  And he got to sleep with the best reindeer!</p>
<p><em>This is him:</em></p>
<p><iframe loading="lazy" title="YouTube video player" width="480" height="390" src="https://www.youtube.com/embed/E6qGi--bkXo" frameborder="0" allowfullscreen></iframe></p>
<p>Without going into details, it is more or less true that your body adapts early in life, but for the rest of your life, to the range of temperatures to which it is exposed when you are little, after infancy but through toddler years.  The way your skin gets configured, with blood vessels and sweat glands and so on, and some things having to do with neurons, adapts to control heating and cooling, and as an evolutionary aside, comfort for a certain range. Lots of things adapt as we grow, but these things are sorely understudied.  The assumption that you are a product of your genes right down to the details is too pervasive.  For instance, how well you see detail in various conditions adapts.  If you grow up in Arizona you will have a different way of seeing than if you grow up in the Pacific North West.  Well, not if you grow up in Phoenix vs. Seattle, but if you grow up in the wilderness in those two areas.  Colin Turnbull has a story about this in relation to Pygmies which I will not relate because I think Colin put the Bull in Turnbull and I don&#8217;t trust most of his stories. But I have an Efe Pygmy story that might relate and is true:  If you give some Efe Pygmy men a mammal identification guide so they can pick out a picture of some animal they just saw, so you can relate the observation to Western Linneonormative Classification Schema, they hold the book upside down as often as right side up.  That is what we might expect from people who don&#8217;t read at all, they hold the book randomly.  But then, they&#8217;ll start rotating the book around so they see the picture of the monkey &#8220;right side up&#8221; and &#8220;up side down&#8221; and everything in between. Then they&#8217;ll make their ID. I never see Westerners do that, but it makes sense.  A western book held by a western person shows a picture of an animal sitting or standing there, and you hold the book up in normal book position and you imagine you are up in the tree staring at a monkey standing on a branch ten feet away.  But in real life, you almost always see monkeys that are above you or nearly above you.  In a rain forest, the arboreal mammals that are not above you are too far away to see well, and behind too much vegetation. They are shadows crossing distant gaps.  Efe not only see correctly in a forest, but they know how to adapt the book to use it to represent that way of seeing.</p>
<p>And they see better. As I mentioned above, I spent a lot of time in a forest growing up, so I may be better than some Arizonan guy at seeing detail in a forest.  But not like the Efe.  One time I was talking to my friend (in the Ituri) about a particular species of snake.</p>
<p>&#8220;I&#8217;d like to see one of those,&#8221; I said.  We were sitting right in our research camp.  He chucked.  &#8220;What?&#8221; I said.</p>
<p>&#8220;Come over here,&#8221; he stood and walked away beckoning me to follow.  I followed.</p>
<p>&#8220;There,&#8221; he said, pointing.</p>
<p>I looked.  I saw nothing but branches and leaves.  &#8220;What am I looking at?&#8221;</p>
<p>&#8220;Your snake.&#8221;</p>
<p>&#8220;Really? Where?&#8221; raising my hand to point at the bushes that lined the path down to the water from our base camp.  He grabbed my hand to stop it from going near the bush.</p>
<p>&#8220;Right in front of you.  You almost touched it.&#8221;</p>
<p>Now, this is a snake he had seen from about 100 feet away, a snake that I was now in reaching distance of, apparently, but could not see.  The snake in question, by the way, was a &#8220;boomslang&#8221; a.k.a. &#8220;green tree snake&#8221; &#8230; the are small, green, and blend in very nicely with the green trees.  Nasty venom. Apparently, this one was perfectly camouflaged.</p>
<p>&#8220;I still don&#8217;t see it.&#8221;</p>
<p>&#8220;OK, stand back,&#8221; he said as he raised his bow, arming it with a <a href="http://scienceblogs.com/gregladen/2011/01/how_to_make_poison_arrows.php">monkey arrow</a>.  Efe men always carry their bow and a few arrows with them.</p>
<p>He drew the bow, took a breath to stop himself from giggling (at me), and fired.</p>
<p>And the arrow went through the snake in at least three places, so the now squirming reptile could not extricate itself from the branches it was effectively pinned to.  I could finally see it. At first I felt bad that the snake had to die to teach me a lesson, but then it occurred to me that my friend was surely going to kill this snake on his way back to his camp anyway.  He had seen it, after all.  And, a snake an Efe sees is a dead snake.  They do this to keep the chances of being bitten by poisonous snakes down, and since his uncle had lost a leg to a viper in his youth, one could understand this especially in his case.</p>
<p><em>Boomslang:</em></p>
<p><iframe loading="lazy" title="YouTube video player" width="480" height="390" src="https://www.youtube.com/embed/qnlr-lrlPzw" frameborder="0" allowfullscreen></iframe></p>
<p>But the point is, to him, seeing an 18 inch long green snake in a green bush over 100 feet away was like me seeing my bus coming down the avenue.  On a hot day, which I would not think of as too hot because I grew up without air conditioning.</p>
<p>One&#8217;s comfort zone, one&#8217;s path in life, one&#8217;s personal history.  A lot of people call it free will, but it&#8217;s not.</p>
<p><em>Sorry for going all Philosophy on you:</em></p>
<p><iframe loading="lazy" title="YouTube video player" width="480" height="390" src="https://www.youtube.com/embed/PtgKkifJ0Pw" frameborder="0" allowfullscreen></iframe></p>
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