GLY-1102 Lecture Notes - Lecture 17: Dinos, Plateosauria, Onchocerciasis
17 Sep 2018
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Document Summary
Feathers are a modification on already existing part of lizard skin, not unusual for them to evolve something like a feather. Sinosauropteryx best evidence of feathers, still not flying. Caudipteryx fan shaped tail, more plumage, eating rocks to grind up food, not flying. Feathers possibly to keep small, active animals warm, then to attract mates, for camo, fend off predators. Tail is shortened, blunt wedge end for counterbalance weight (pygostyle, moves end feathers around) Alula thumb wing, comes later, helps give control at low speeds, helps especially in landing. Archeoraptor part of two fossils put together, hoax to make a primitive bird. Dilong close relative to trex, fully feathered. Microraptor 5 wings, first to have wings on hind legs. Hell pond, things fell into it and died. If not for feathers, it would be labeled as a dino. Feathers all correct, if muscle mass was great enough it could have flown.
