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Re: Endothermic Crocs in Nature



Jura <pristichampsus@yahoo.com> wrote:

The results of automatic
endothermy are NOT a high activity level and
endurance, both of these have been shown to be
independent of automatic endothermy (see mako sharks,
tuna, bees, ants, and near any autarchoglossan lizard,
for examples).

Lamnid sharks (makos, great white shark, porbeagles) have a system known as "regional endothermy". Here's a summary:


http://www.ncf.carleton.ca/~bz050/wsphysio.html

Larger animals do not have higher metabolic rates than
smaller animals. They have LOWER metabolic rates. An
elephant might eat a lot of food per day, but compared
to body size, it is but a tiny fraction of the food
consumed by a gerbil everyday. It's amazing how much
energy can be saved when one isn't just burning up
everything to keep warm.

I have to agree with you here. The high surface area to volume ratios of small mammals (and birds) means they have to eat much more per unit body weight than a larger-bodied terrestrial endotherm. In general, anyway.



Tim