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Found it in the Results section:

> On average, 83% of captures were consumed by the cats (88% of invertebrates, 79% of reptiles and amphibians, 78% of mammals and 50% of birds) and the remaining items were left at the site of predation.

Right. Feathers and bones don't digest well.

I think they meant the cat left 50% of birds completely alone. Not that they ate 50% of the mass of every bird. This is based on owning an outdoor cat and having it bring intact corpse trophies to the door.

Was gonna say, 83 percent sounds better than humans.

Most times I've seen mammals eating other mammals, they consistently leave behind what looks like the stomach and maybe some guts. Often it's very cleanly removed, and piled with other inedible bits like tails and paws