Think humans have weird childbirth? Imagine if your dad gargled you and all 99 of your baby siblings for 2 weeks. Well that's exactly what the Yellowhead Jawfish father does, keeping more than 100 fertilized eggs carefully placed in his mouth. The fish occasionally opens wide, spits the eggs out, and collects them again, rotating them in the process to ensure even oxygenation. Mouth-brooding lasts between one and two weeks. During that time, he does not eat any food, devoting all of his energy to caring for its spawn.