ANN ARBOR, Mich., May 2 (UPI) -- Researchers say the large number of carnivore fossils found in a Spanish cave suggest it had a "killer" entrance that trapped animals intentionally entering it.
Soledad Domingo from the University of Michigan along with colleagues from other institutions said a large assortment of saber-toothed cats, hyenas, an extinct "bear-dog," ancestors of the red panda and several other kinds of carnivores died under unusual circumstances in the cave near Madrid between 9 million and 10 million years ago.