I didn't know there was a type of bird called a shrike until long after I read Hyperion. The birds look and sound like cute little songbirds, kind of like a smaller mockingbird. But the way they hunt is hardcore. They capture small prey (lizards, grasshoppers, etc) and impale them on a spike from cactus or a broken branch. Then they return to eat them at their leisure.

It's rare to see their caches but a few times I've been out hiking in the desert and seen the remains of a little critter on a cactus thorn.