A Louisiana aquarium is investigating how a baby shark hatched without a male present for three years. Experts suspect delayed fertilization or parthenogenesis, a rare form of asexual reproduction.

At an aquarium in Louisiana, the arrival of a baby swell shark has caused a flurry of commotion ... The phenomenon has been seen in some birds, fish, snakes, and lizards. The other possibility ...

Aquarium staff in March began watching over the shark almost around the clock every day. Then, around 10:30 a.m. on June 17, part of the baby’s tail fin emerged, and the entire body came out at ...