From Phys.Org:
A small international team of molecular and evolutionary scientists has discovered that male yellow crazy ants (also known as long-legged ants) have two sets of DNA throughout their bodies. In their paper published in the journal Science, the group describes the unique find and discusses possible reasons for it. Daniel Kronauer with The Rockefeller University has published a Perspective piece in the same journal issue discussing the work by the team and suggests that the unique genetic feature of the ants may explain why they are such a successful invasive species.
Prior research has shown that yellow crazy ants, which are native to Asia and West Africa, have the ability to adapt well to new environments, making them a successful invasive species. Now it turns out that they may have an advantage that has not been seen before: Males have dual sets of DNA. One of the most basic concepts of biological science is that multicellular organisms develop from a single-cell zygote into a creature with a unique genome. The only exceptions to this rule have been chimeras, which are generally considered accidents of nature. In this new effort, the research team found another exception—male yellow crazy ants with dual sets of DNA.
More here.