Category Archives: Morphology and Diet

Evolution of Birds: New Evidence for Foraging Behavior

Birds evolved during the Mesozoic, during the various “Ages” of the dinosaurs, as a subset of those dinosaurs. Many researchers believe that these early birds were different from their then very close dinosaur cousins because of their flight adaptations, and some have linked this idea to flight-based or tree- based foraging.Today, most birds fly (counting by species) and their flight is linked to their primary dietary adaptation. Some birds actually feed on the wing, while others fly to food sites and once there do not locomote very much. Other birds forage on the ground habitually. The difference between these two kinds of birds should be evident in the morphology of their feet.If you examine bird feet today and can successfully characterize these feet in a way that links reliably to mode of foraging, then you should be able to look at Mesozoic bird (and dinosaur) feet and say something about how they foraged. In this way, you can test the hypothesis that early birds were flight- and tree-foragers rather than foot-foragers. A paper in Current Biology does this. Continue reading Evolution of Birds: New Evidence for Foraging Behavior