Piranhas belong to a family of bony fish characterized by highly developed dentition. They’re cousins to the pacu fish, which has dentition eerily similar to human teeth. Unlike pacu teeth, which are ...

What has needle-like teeth so large they don’t fit inside its mouth, a huge gaping jaw that completely engulfs its prey, and lives in the ocean zone where sunlight can’t reach? That would be the ...

The stomach of the longnose lancetfish — a.k.a. the mysterious “twilight zone fish” — yielded entire squids and undigested fish Bailey Richards is a writer-reporter at PEOPLE. She has been working at ...