June 15, 2006—Human dads will be the first to tell you how hard fatherhood can be—sleepless nights, dirty diapers—and that's only after the baby is born.

In the wild, the biggest Father's Day presents should probably go the seahorse, one of the only male animals known to get pregnant and give birth.

Join scientists in South Africa as they go in search of the endangered Knysna seahorse, and explore how a seahorse dad becomes nature's Mr. Mom.