Darwin’s finches are a classic and historically important example of a species radiation (sometimes called an “adaptive” radiation, but that implies a specific assertion about the cause of the radiation which may not be appropriate in all cases). During the five weeks that Darwin spent on the Galapagos in September, 1835, he made a [...]
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The Avian Brood Parasites The Avian Brood Parasites Brood parasitic birds lay their eggs in the nests of other birds (the “hosts”) who then raise them as their own. Examples of parasitic birds includes the cuckoo, cow birds, widow (“whyda”) birds, honeyguides, and even the South American Black-headed Ducks. Brood parasitism is virtually a [...] Golden Eagle I hope I won’t disappoint you … this is not about John Ashcroft. It is about golden eagles (actually, maybe its about one golden eagle in particular). The golden eagle (Aquila chrysaetos) has been in decline for a very long time, so you may not know it formerly bred in a much [...] |
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