Species that may overwinter outside of their natural habitat

I'm no expert in this but anecdotally, there are definitely a bunch of 'tropical' species that have a suprising resilience when it comes to low temperatures. This could be for several reasons. First, it's elevation: even in the tropics, it gets suprisingly cold at higher altitudes, and you'd expect species here to be able to cope with low temperatures. Also, some species are widespread, and while they may be found in tropical places, but perhaps on the periphery of their range they have to adapt to cooler seasons. It also helps to be 'cold blooded', which is both an advantage and disadvantage when it comes to cooler temperatures (an disadvantage because they need external warmth for their metabolisms, but an advantage because if cooler temperatures slow their metabolism, they also use much less energy when hibernating).

A friend of mine with a butterfly greenhouse in the Netherlands was suprised to see Eryphanis butterflies in spring; he stopped heating the greenhouse in winter due to the expenses (winter stop!). Turns out, there were still hidden Eryphanis caterpillars in the bamboo that survived winter in Europe in the unheated greenhouse and pupated in spring when temperatures became higher! It's hard to know the limit of every species at tropical latitudes, but some of them (but not all of them!) can be unexpectedly hardy. Especially those also found on higher altitudes I suppose.