Last year this hen sat on some eggs and after finding 3 dead chicks I figured out she was killing them, and put the eggs under another hen. This year she stole a nest of eggs from another hen so we let her try it again.(thinking it was because last year she was young and it was her first time going broody) We've been checking the nest each morning and keeping a close eye on her. We were gone for 4 hours today and came home to find 2 dead chicks and one hiding...alive. I booted her off her nest and put her eggs and 1 chick in the incubator. She pecks them to death as soon as they break from the shell. There are bloody peck marks on their tiny wet heads/bodies. Anyone have a clue about why? It's definitely her, no other chickens had access to her or her eggs. I've never seen this before. She certainly won't be allowed to sit on any more eggs.