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.

According to the aquarium, the shark egg was first spotted eight months ago. The shark hatched a few weeks ago and the team at the aquarium is working to determine how it was conceived. Once the shark is big enough for a blood draw,

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

There’s a paternity mystery to be solved in Louisiana. Earlier this month, a swell shark egg successfully hatched at the Shreveport Aquarium. The egg was first spotted by the aquarium’s team about eight months ago and had been closely monitored.