Was the giant Wallace’s bee that has a 3″ wingspan, giant mandibles, and is entirely black, an extraterrestrial species introduced at some point to cause harm to our biosphere?

This, interestingly enough, was brought by the Anunnaki, so not all foreign species were introduced by Reptilians, some were introduced by the Anunnaki as well, and as they have been here longer, have done much mischief to interfere with the world you inhabit. That is the reason for its great size, it is more in keeping, in terms of scale, with their much larger stature than human beings, and that is true of much of the life on their planet as well.