Something like 30 years ago I had a cockpit ride on a BA747 departing Singapore. After we'd taken off the Captain asked if I'd seen it. The answer was no and, to this day, I can't remember what animal had wandered into view. However, he then went on to tell me that not that long ago he had hit a Hyena on departure from Nairobi except he didn't see it and all he had felt was a slight vibration that he ignored until he arrived in London and was asked to inspect the undercarriage where the remains were still visible!