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In a message dated 95-12-08 10:46:00 EST, longrich@phoenix.Princeton.EDU
(Nicholas R. Longrich) writes:

>       So yes, small animals like squirrels are a lot less likely to 
>suffer broken bones. One reason arboreal animals often tend to be small. 
>Another way, of course, you can decrease broken bones or injuries in 
>general, upon hitting another branch or the ground, is to increase 
>surface area: probably one function of a squirrel's tail, probably a 
>reason why flying squirrels might have started evolving patagiums, and 
>possibly a good reason for an arboreal theropod to evolve some longer 
>feathers (not necessarily the vaned kind).

But of course.