JIM WEST / SCIENCE PHOTO LIBRARY JIM WEST / SCIENCE PHOTO LIBRARY
Agate Fossil Beds National Monument. Fossilised skeletons of a beardog (Daphoenodon sp., left) confronting an entelodont (Dinohyus sp., right) at the visitor centre of the Agate Fossil Beds National Monument, Harrison, Nebraska, USA. The fossilised skeletons of hundreds of ancient animals were discovered here in the early 20th Century - including hundreds of the two-horned rhinoceros Menoceras.
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