What happened with Archaeopteryx?
10,000 Birds
AUGUST 18, 2011
This has happened before, Archaeopteryx and the bird family tree have had an often tenuous relationship. Of those traits, there are two kinds: The ones that are bird-like, but are not shared between birds and other animals because of a common ancestor having had the trait. Horses have six upper and lower on each side.
Let's personalize your content