Although countless people regularly use public transport in Istanbul, Turkey, one passenger in particular stood out from the rest. His name is Boji, and he was a stray dog. No one knows where the canine came from or when he started riding trains and buses. For some, it felt as if he’d always been there. But a few answers began to emerge after a tracker was placed on the pooch.

Some dogs are career crime-solvers, but canines aren’t the only detectives in the animal kingdom. There are loads of accounts telling how our furry — and not so furry — friends have cracked cases, some of which not even us humans could solve! From little birds tweeting vital information to sharks lending police a helping fin, you’d be surprised how animals have helped end mystifying investigations.