Animal bones found at bottom of Hoyo Negro shed light on the Great American Biotic Interchange

A team of researchers from the U.S. and Mexico has found bone skeletons at the bottom of the Hoyo Negro cave that show that some animals thought to have existed only in South America also existed in Mexico. In their paper published in the journal Biology Letters, the group describes their recovery and study of multiple skeletons retrieved from the floor of the Hoyo Negro cave and what they learned from them.