Ancient humans may not have interbred with Neanderthals, after all

If you hail from outside of Africa, there's a decent chance that you share as much as 4% of your DNA with a long-extinct lineage of Neanderthals. Many scientists agree that this small percentage of shared genetic information is evidence that humans and Neanderthals interbred with one another in Europe tens of thousands … » 8/14/12 7:20am 8/14/12 7:20am

Snails once flew over Mexico (in the bellies of birds)

The Pacific and Atlantic horn snails were once the same species, until a land bridge blocked their path between oceans. But genetics suggest these snails still interbred long after they were cut off from each other. How? Thanks to the snail-eating birds. » 9/14/11 7:40am 9/14/11 7:40am

Ancient humans were just having sex with everyone

We know that as ancient humans expanded into Eurasia, they began interbreeding with our Neanderthal cousins. But it now appears that the fun didn't start there - our ancestors also reproduced with precursors like Homo erectus and Homo habilis. » 9/06/11 4:31pm 9/06/11 4:31pm

Genetic evidence reveals that polar bears originally came from Ireland

Every polar bear alive today shares a common maternal ancestor, and it isn't even a bear from the same species. Their mitochondrial DNA reveals a 100,000 year story of interbreeding and hybridization...and the story is far from over. » 7/07/11 2:00pm 7/07/11 2:00pm