When a shark egg appeared one day in a shark tank at a Louisiana aquarium, staff were puzzled. That’s because the tank only has two sharks in it — and they’re both female.

A small shark swimming around a Louisiana aquarium holds a mystery in its DNA. Yoko the swell shark hatched from an egg that was discovered in a puzzling place — an all-female tank, the Shreveport Aquarium announced. “It really proves that life ... uh ... finds a way,” curator Greg Barrick said in a Jan. 24 news release.

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.

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

When a mommy shark and a daddy shark love each other very much, sometimes they decide to have a baby shark. But sometimes when a lady shark is just chillin' with her girlfriend shark, and no dude sharks in sight,