Yoko the swell shark was born in a habitat of all-female sharks who hadn't seen a male in years. The aquarium has two possible explanations — and hopes to get confirmation in the coming months.

The pup hatched in a tank housing two female sharks who hadn't been around any male sharks in over three years.

The Shreveport Aquarium in Louisiana is investigating the mysterious birth of a baby swell shark, despite no male sharks being present in the tank for three years.

A swell shark pup at the Shreveport Aquarium in Louisiana hatched from its little egg on January 3. This one came without the presence of a male shark.

Officials with the Shreveport Aquarium recently announced the unusual birth of a swell shark pup in a tank where only two female sharks were present.