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Re: erect posture and its implications
for that matter, so do bats and they have the highest recorded distance
for mammalian migration at that.
(that would be some of our local US bats too)
> While it may be stretching "terrestrial" to its very limits, modern
> birds like swallows or robins (not ducks?) are migrating insectivores.
> Do they, in fact, fit the "high metabolism" model?