On January 3, the Shreveport Aquarium in Louisiana welcomed a swell shark pup into the world under mysterious circumstances: It was born in a tank that housed only two sharks—and both were female.

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. Named "Yoko" from the Chumash word "onyoko ...

Experts say the case is either a rare form of asexual reproduction or an instance of (very) delayed fertilization Margherita Bassi Daily Correspondent The swell shark pup at Louisiana's Shreveport ...