feast upon

"Once having penetrated a living plant, fungi can choose three strategies. They can be harmful parasites and suck the life out of their new hosts; they can lurk like vultures, waiting harmlessly for the plant to die, and be the first to feast upon the "carrion"; or, they can begin working together. Some Mycena species are gradually developing the ability to collaborate, though it has yet to be finely tuned," says Christoffer Bugge Harder.

At the same time, it can make prey less accessible — say, by keeping the zooplankton salmon feast upon from rising to the surface for an easy supper.

Why would he hunt, slaughter, and feast upon human flesh if he doesn't need to?

And, if we the audience can be repulsed by that – and his evident choice to slaughter and eat flesh when there is abundant satiety that doesn't cause violence, pain and loss – then perhaps we need to venture a little deeper into our own psyches and ask: Why would we feast upon flesh if we don't need to?

They’re facing an eternity in Staten Island — which may be redundant — and what else is there to consume when the humans they feast upon taste sad?