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Myth-Buster · Jun 7, 2026 · Citadel Culebra Faculty

The Cold-Blooded Myth, Debunked

'Cold-blooded' is one of the most misleading words in biology — and it shapes how people treat reptiles for the worse.

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The Cold-Blooded Myth, Debunked
Anatomy & PhysiologyHusbandryMyths & Misconceptions

Call an animal 'cold-blooded' and people picture something sluggish, primitive, and unfeeling. Reptiles are none of those things. They're ectotherms — their blood runs as warm as ours when they're at temperature — and the difference is everything for how we keep them.

What this resource covers — ectothermy vs. endothermy, behavioral thermoregulation, why the term distorts care, fever response in reptiles, and what 'cold-blooded' gets wrong about behavior.

This is a free entry in the Citadel Culebra Library, expanded continuously by our faculty. The complete write-up is on the way — and members get every new entry first inside Culebra Connect.

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