Reproduction in the animal world is all kinds of freaky, from penis jousting to mammals laying eggs, there seems to be just about every method going. However, one thing that is not common is females of one species being able to produce offspring of another, but that's exactly what has been discovered in Iberian harvester ants (Messor ibericus).

M. ibericus ant queens have been discovered to produce not only offspring of their own species, but also offspring of a different species due to a reproductive mode scientists are calling xenoparous. 

It's “almost impossible to believe and pushes our understanding of evolutionary biology,” Michael Goodisman, from the School of Biological Sciences at the Georgia Institute of Technology, who was not involved with the new research, told Science. “Just when you think you’ve seen it all, social insects reveal another surprise.”