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Re: Why insulation = endothermy
> and even
> insects over 1 gram. (I have read the work on insect energetics,
> and all flying bugs over 1 g are endotherms. Below 1 g it is not
> possible to be endothermic no matter what the metabolic rate or
> insulation are like.)
Well, so much for the furry caterpillars. Those (or at least the
species I am familiar with) are right around a gram (they are really
I can certainly accept a feathered bird or dinosaur with a basal
metabolism (and aerobic capacity) just barely above that of reptiles.
Indeed, one should probably *expect* such a stage in the transition
from the reptilian physiology to the modern avian one. I do not see
how the modern avian body temperatures could be maintained *without*
insulation. This means that insulation had to evolve prior to acquiring
the full modern metabolism.
The peace of God be with you.