Back when I was still learning to fly, sitting ready for departure at EGHH. Was watching various livestock running around taxi and runway, including a fox which was chasing a rabbit!
More recently. Was talking with a skipper on turnaround in a 737 at a remote north african airfield. There was a dead dog (looked like he might have been a big bugger once) on the runway. A succession of landing aircraft were slowing pounding the remains into the runway. It still caused a bump on the takeoff roll.
The skipper mentioned something about being carefull about the camels, which had a tendency to cross the runway unexpectedly.
Aswan. every time I went in there, there were dogs on the taxi way, lazing around.