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I recently found out that there are killer whales that live in the Gulf of Mexico, but they are smaller than killer whales that are commonly found in the Pacific Ocean. Why is it they are smaller in size?

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Animals living in colder climate / environment are larger because this way they have better body surface / volume (mass) ration thus they're more resistant to cold. Animals living in warmer areas are smaller thus they have larger body surface compared to their volume(mass) to dissipate heat easier. Check this wiki page for more details.

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  • $\begingroup$ Has Bergmann's rule been suggested for the size disparity in Orca? $\endgroup$ – kmm Mar 29 '15 at 3:17
  • $\begingroup$ It's a general rule, but as written on the page I inked there may be exceptions, yet I do not see reason why would it not apply for Orcas. $\endgroup$ – Nandor Poka Mar 29 '15 at 5:48

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