Killer Cuckoo Catfish, National Geographic

A mother cichlid fish protects her young by keeping them in her mouth. But these crafty cuckoo catfish have caught on and they re angling to turn her offspring into dinner. Subscribe: About National Geographic: National Geographic is the world s premium destination for science, exploration, and adventure. Through their worldclass scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what s possible.