Researchers have gained new insights into rhinoceros evolution and the longevity of the North Atlantic Land Bridge from analyzing the perfectly preserved fossils of a "frosty" Arctic rhino.

An argument over whether fossils from several small dinosaurs represent a juvenile Tyrannosaurus rex or smaller adults of a separate species may finally be settled.

Authorities have killed several lab monkeys that escaped from an overturned truck in Mississippi. The rhesus macaques were initially thought to be diseased and dangerous, but that's not necessarily the case.