You can’t tell simply by the sounds because there are multiple possibilities—with likely culprits being rats/mice, squirrels, possums, bats, and raccoons. What’s most important: when you hear the sounds, don’t try to take care of the problem, DIY. You don’t know what problems you’ll encounter with cornered wildlife likely to bite or otherwise react badly. So, contact wildlife removal professionals, and let us take care of the issue for you.