We once had an Army CH-47D crew refuse an aircraft for a green tree frog (about 2” long) loose in the combining transmission cooling fan. They said it was FOD, we said once the fan started it would find a more comfortable place to be.
A crew recently found a kitten after a 3 hour training period *on Post Flight*, in the upper ESSS fairing on a UH-60.
Also recently, we were briefed to remember that Apple AirPods are FOD and shouldn’t be worn on the aircraft after a slightly worse for wear AirPod was removed from a T700 engine during tear down by our engine shop.
FltMech