What could be under my house?

Lately, me and my bff have been hearing strange, creepy, spooky, and boomy noises under my house. The only thing under there is my 9 month old kitten Bop-Pob. The boom noises scare my cat half 2 death! He scratched my bffs shoulder the first time it boomed. I am desperate 2 kno! And if u need 2 kno wat kind of wildlife is around my area, well, i live in perry, Florida. So theres lots of bears, raccoons, and snakes!