BIO 2135 Study Guide - Final Guide: Flight Feather, Karl Agathon, Keratin
21 Mar 2016
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They all discard the eratinized cover: one of 4 that lew, both bird therories are related to insetcs. So what happens was the irt feather reptiles used them to sweep the air and catch any lyig insect. Ncestor was lappig its wings and captured insects. Great example of convergent evolution: ac is where the leg is inserted, pubis bone points backwards, runs parallel to __, bipedal stance is used for perching, typical hollow bones of birds. Has reinforcing struts helo in making strong bnes in only the direction it needs to be strong: beak of the bird is almost pure keratin, feet has been modiied to allow for a great grip. Can make a clamp leg attachment: they have a set of airsacs present. Ther an anteriri and posteriri set: air is brough in, unidirectional low into the lungs, no dead air within the system, they have vibrating membranes bords use ot make sounds, ____can vibrate at dif frequencies.
