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Re: The Right-to-Left Shunt of Crocodilians Serves Digestion (body fat)

This made me wonder about body fat:
With the exception of preflight juveniles (which often outweigh their parents) and premigratory birds, most species don't put on weight. This is true even in areas where a lot of climatic stress can be anticipated.

Presumably, this has to do with population specific highly optimisation of weights for flight efficiency, predator evasion etc.

I don't have many lizards in my ecozone but I get the impression that they tend to grow larger instead of putting on large amounts of body fat (as many mammals do).

Were there similar pressures controling optimum weight among Dinosaurs? With the exception of large whithers is there any way to infer the amount of body fat that would have been carried by an animal? Is this really a relevant question given the fairly short adult lifespans infered for many species?


-Jonas Weselake-George

----- Original Message ----- From: "Hope, Sylvia" <shope@calacademy.org>
To: "DML" <dinosaur@usc.edu>
Sent: Friday, February 08, 2008 8:53 PM
Subject: RE: The Right-to-Left Shunt of Crocodilians Serves Digestion

Birds lost it right about the time the first bird got up and tried to fly off
on a full stomach.

Birds have lost the shunt capability present in crocodiles and reptiles

- SH.