From Professor Jerry Coyne’s website, Why Evolution Is True, this post by Matthew Cobb tells of some gruesome but practical behavior by a population of Eleonora’s falcon off the coast of Morocco.
It seems this hawk captures smaller birds for her chicks, but doesn’t kill them immediately. Instead, she imprisons them alive until they are needed for food. Click the link above to let Professor Cobb tell the story.
Incidentally, I recommend Why Evolution Is True for liberal, skeptical readers with a wide range of interests. It’s on my daily reading list. And his book of the same name is one of the best books I’ve read for presenting the evidence for evolution.