My dreamed drawing came out...I can't describe how awesome *u*
<--inspired me <3
How Feathers Evolved: THE HEAT (And Cold) IS ON!Feathers are a structure that are unique to only one group of living animals: The Neornithines, the family of animals that includes all living birds. However, back in the past, these filaments were much more diverse. They were seen in a variety of creatures that possesed such filaments, from the pterosaurs of the sky, to the mighty tyrannosaurs that ruled as top predators in the last 10 million years of the Mesozoic. But where did these stuctures come from and why did they appear all of a sudden?
To understand this, you need to know what a feather is. A feather is a filament that sprouts from the skin, like mammalian fur and hair, and like fur and hair, it is made out of the same substance, called keratin. However, they are made from different types of keratin. Mammalian fur and hair is made out of alpha keratin, while feathers are made out of beta keratin. Beta keratin is also found in the scales of crocodilians, as a study shown in 2006 demonstrates that croc scales are closer to bir