What potential metabolic state is debated for Xiphactinus compared to most modern fish?
Answer
Regional or full endothermy (warm-bloodedness)
A fascinating scientific debate centers on the metabolism of *Xiphactinus*, suggesting it may have utilized some degree of regional or complete endothermy, meaning it could regulate its body temperature internally (warm-bloodedness), unlike the typical ectothermy (cold-bloodedness) of most fish. The sheer size of the creature, potentially exceeding 500 pounds, coupled with its inferred high activity level as a pursuit hunter, necessitated a substantial and sustained energy budget that points toward maintaining elevated internal temperatures, similar to modern lamnid sharks or tuna.
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