t-rexs didnt evolve into birds. thats just 1 of many theropods. and a t-rexs skeleton structure is more similiar to a modern day birds than a pterosaurs skeleton structure.
and a t-rex is far more similiar to a modern day bird than a pterosaur in many other aspects. look at this link
http://www.msnbc.msn.com/id/18075420...ino-bird-link/
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