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Thread subject: Birds as Reptiles.
||07/09/05 01:40 pm
||Some interesting info about the coonnection of birds with reptiles.It has been long recognised that birds have evolved from REPTILES.( Thomas Huxley, remarked in the 19th centuary, that birds were merely glorified reptiles)
Well they do share some commonalities/characteristics.
1) the skulls of both articulate with the first neck vertibra by means of a single ball-and- socket joint,
the occipital condyle. Mammals have two condyles.
2) Birds and reptiles have a single middle ear bone, called the STAPES, Mammals have three bones in their middle ear.
3) The lower jaw, lower mandible, of birds and reptiles have several , five or six bones on each side. Mammals only have one.
4) The ankles of birds and reptiles are sited in the tarsal bones, not between the tibia and tarsi in mammals.
5) The scales on the legs of birds are similar to that of reptiles.
6) Both birds and reptiles lay an egg with a yolk where the embryo developes on the surface of the yolk.
7) Birds and reptiles have nucleated red blood cells . Mammals do not have nuclei in their red cells.
8) Their eyes are supported by the sclerotic ring
9)They share several features in the skull including an expanded lateral braincase.
Just a little TRIVIA while we wait........for the rest of the FANS on this board...hope they are having a great time.
||07/09/05 05:11 pm
||There is a great exhibit on right now at our local museum called Feathered Dinosaurs. We took the kids last month and it was quite fascinating!
(I am a huge dino fan!) Great info, Marie, thanks!