Here is a piggy. Isn't it cute? It might not be when you learn that farmers have a major problem with pigs because they engage in a behavior called "savaging" — a gruesome act which involves female pigs attacking and killing their own piglets.
Eclectus parrots make their nests in parts of Australia where floods are extremely common. When their nests start to flood, the parrots make a grim decision. They kill their chicks...but only the male ones. What drives them to commit gendercide?