[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index][Subject Index][Author Index]

Re: a theory regarding maniraptoran origins



Quoting Anthony Docimo <keenir@hotmail.com>:

Nowadays, many gliding species  (at least of mammals)  go horizontal
while gliding....but when they are about to land on the next tree
trunk, they arch their bodies so their hind legs hit the tree first.

With the hypothetical rats, it was a short step from such gliding, to
gliding rats that developed hind-claws  --  just like the maniraptors.

Folding up the third 'wing' (the tail fan) at the last moment might have facilitated this. Of course in 4-winged (or 5-winged if you include the tail) species, the lowering of the hind limbs for landing would have facilitated this even further (assuming the 'butt fans' played any part in generating lift in the first place).


--
___________________________________________________________________

Dann Pigdon
GIS / Archaeologist         http://heretichides.soffiles.com
Melbourne, Australia        http://www.geocities.com/dannsdinosaurs
___________________________________________________________________