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*To*: "Jonathan R. Wagner" <znc14@ttacs1.ttu.edu>*Subject*: Re: Incredibly preliminary size estimate for new T. rex*From*: Jeffrey Martz <martz@holly.ColoState.EDU>*Date*: Sun, 21 Sep 1997 17:31:12 -0600 (MDT)*Cc*: dinosaur@usc.edu*In-reply-to*: <01INV7DOPFJ28X0XC1@TTACS.TTU.EDU>*Reply-to*: martz@holly.ColoState.EDU*Sender*: owner-dinosaur@usc.edu

I wrote... > >2) this size may represent the upper limit for theropods. Jonathan Wagner wrote... > I am very wary of statements > like #2 above, both because of limited data (we only have so many very large > theropods from the K to compare), and because of unsubstantiated > assumptions (e.g. there is an "upper size limit" [logical, but can we > assume it?], Hence the "MAY"... > Now, I understand why workers may feel > compelled to invoke such arguments in the case of sauropods. However, it > should be noted that every time we think we've pegged the "limit", a new, > bigger specimen comes around. You are right about the crappy sample size, but I don't think it is an unreasonable idea that a group of animals sharing a similar basic design living generally similar lifestyles (predation? scavenging?) might have a size limit beyond which pursuing that lifestyle becomes unfeasable. For example, if we suppose that T.rex, Carcharodontosaurus, and Giganotosaurus were all predators of extremely large prey (hence the large size), then perhaps above a certain size this becomes unfeasable. Just as sauropods MAY represent the maximum possible size an mobile terrestrial animal can get composed of normal bone and muscle in the Earth's gravity, PERHAPS the Big Three represent the same for bipedal predators who can safely chase down, grapple with etc.. thier prey. This is just speculation, but active lifestyles get more hazardous the more massive you get; remember the numbers from Dr. Farlow's "tripping T.rex" paper. LN Jeff O-

**References**:**Re: Incredibly preliminary size estimate for new T. rex***From:*"Jonathan R. Wagner" <znc14@ttacs1.ttu.edu>

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