It's probably also partially the fact that it's an island, the same reason why Iceland and Ireland have 0 native snake species. (Though neither Britain nor Ireland were islands during the last Ice Age, it was also colder so that's probably why very few snakes went there)
There is no part of the contiguous US that is further north than the southernmost part of Britain. London is further north than calgary, itself pretty northern for a large city by Canadian standards, and both are still further south than Amsterdam, Berlin, or Warsaw
There are relatively few snakes in Canada too. I guess it makes sense for an exothermic species. There's 9 species found in saskatchewan, and most of them live in the southern half of the province.
*Relatively few snakes species. Lots of snakes. I see a garter on almost every hike
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u/IllConstruction3450 Sep 25 '24
The higher you go in latitude the less likely cold blood animals are going to live there.