Richard W. Travsky writes:On Fri, 28 Sep 2007, Dann Pigdon wrote:Guy Leahy writes:
http://news.bbc.co.uk/2/hi/asia-pacific/7015561.stm Using phylogenetic bracketing, it would seem that
homing instinct is deeply nested within archosaurs,
since both birds and crocodiles exhibit this behavior.
Either that, or the reason crocs and birds survived is because they had this ability, while other archosaurs didn't.
Survived - what? The big impact? I'm not sure I see how a homing ability would aid in surviving that...
Survived. Period. As opposed to being extinct (which embodies a distinct lack of survival).
The point is that we can't assume that anything extant crocs and birds have in common must also have been present in dinosaurs, due to the simple fact that the former two still exist, while the latter are extinct. It may have been the case that the surviving species managed to survive because of adaptations they had (and still have) that dinosaurs didn't.