Pheasants are really stupid birds. They’ll go into a potato patch, dig up a potato, and start eating it. But if anything distracts them enough to make them look away from the potato, they’ll drop the potato. “Ugh!” they say. “Someone’s been eating this potato!” And they’ll move along to the next potato until… “Oh! Gross! Someone’s been eating this potato!”

You end up with a whole line of potatoes with one or two bites out of them.

In my personal little headcanon I like to imagine zombies do the same thing: “RAWWWGGHHH!! DELICIOUS FLESH!!!! MUAAARGHHH… Oh. Gross. This one’s dead. Let’s get another one.”