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*To*: znc14@ttacs1.ttu.edu*Subject*: Re: Deinonychus claws expalined as climbing adaptions*From*: Jonathon Woolf <jwoolf@erinet.com>*Date*: Sun, 27 Apr 1997 16:30:26 -0700*Cc*: dinosaur@usc.edu*References*: <01II5W7UW1HO987V0M@ttacs.ttu.edu>*Reply-to*: jwoolf@erinet.com*Sender*: owner-dinosaur@usc.edu

Jonathan R. Wagner wrote: > > To head off another argument on this topic: many tree climbing > animals do indeed have more than one climbing claw, in addition to other > adaptations (fingers get longer going out, etc.). Thanks, Jonathan. This reminds me of something else funky (IMHO) about _Deinonychus_'s feet. There's a beatiful closeup of a _Deinonychus_ foot on pp. 130-1 of DISCOVERING DINOSAURS IN THE AMNH (Norell, Gaffney, Dingus). This is a left foot, seen in profile from the left. The foot shows a total of four digits, with the innermost one vestigial and the superclaw on the second one from the inside. Each digit on this foot has a different number of phalanges. The vestigial digit has 1. The superclaw has 2. The next digit out from the superclaw has 3, and the outermost digit has 4. This makes the four digits four distinctly different lengths. Correct me if I'm wrong, but don't most dinosaurs' feet have a roughly similar number of phalanges in the major digits? I would at least expect to find the two weight-bearing digits with the same number of phalanges. What benefit did _Deinonychus_ get from this odd shape to the foot? -- JSW

**References**:**Deinonychus claws expalined as climbing adaptions***From:*"Jonathan R. Wagner" <znc14@ttacs1.ttu.edu>

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