I'm so stoked, a friend staying with my for the weekend is bringing me bear (sausages, pre-made, no plains cuts unfortunately) to try. Recently 'discovered' game meats, so I've been on a binge of trying 'new' (new to me) meats. Aside from standard chicken/duck, fish, beef, pork; I've had lamb and bison. Will be trying bear this weekend, and probably some elk. Also have some yak in the freezer, gonna try and get some rabbit. It's really interesting to see what tastes like what.
Third world countries probably don't have them as a staple because they're too high up in trees to bother wasting the time to catch? The whole "not easy to catch, no much meat" probably seems not worth the hassle. I mean, catching a deer isn't that easy (I would assume), but it yields a lot so it's worth tracking for days. Frogs, although not much meat, easy to catch, so why not.
Or maybe they have tried eating them and they aren't that tasty so that's why it's not a staple?