Can't speak for crocodiles but how about land crabs? In mid fifties while working for Lockheed Air Service at KIDL as a line mechanic working midnight shift, we got call to meet a Trans Caribbean DC-6B. Report of problems in cabin. On arrival when door opened we noticed the pax bolted out of aircraft. There were only about a dozen or so, very light load for Trans Carib. Stewardesses also in a hurry to get out along with front end crew.
Seems one daft pax had come aboard in San Juan with two shopping bags which he stowed in the open overhead hat racks as we called them then.
Inflight, when about midway to New York the occupants of the bags, some very large land crabs, clawed their way out and started spilling out of the hat racks on to the seats below. Some panic ensued evidently but with a light load no problems with CG. The F/E killed a few but we found many more, including one large one coming down center aisle with apple core in one claw.
One can only wonder what would have happened with a full load (about 100 in Trans Caribs high density seating). Land crabs spilling onto seated pax would have fomented a stampede for sure and might have produced an unexplained crash into the Atlantic.