This is something feral cats do at least 100 times an hour. Suddenly swiveling their heads in the direction of a potential threat and intensely staring off into the distance. “WHAT WAS THAT SOUND??!!!” . . . .
“Oh. It was a leaf falling to the ground.”
Then it’s back to drinking the milk. At least until the next sound.
In that position, with their back legs primed for take-off, you can blink your eye and suddenly the cat is 100 yards up the hill. I’m told they can go from 0 to 30-miles-per-hour in a split second. Usain Bolt, the fastest human alive, can run 27 miles-per-hour. The average house cat can do 30. And I can assure you, the average feral cat is even faster. Probably because they’re often running for their lives.