Some snakes do have definite home ranges. Rattlesnakes come to mind, with the montane species having a tighter "social" structure and smaller home ranges (likely) and flat desert types like sidewinders having large or perhaps no home range.

Real interesting stuff. Like Lateralis stated, some studies, and always with rattlers it seems, have shown that they "learn" their home range and do poorly if relocated away from it.

Then again, take a rattler, put it in a cage and give it food and it thrives. That isn't its home range.

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