Life
58-million-year-old footprints show when mammals began paddling in sea
A set of 58-million-year-old footprints suggest hippo-like mammals were living by the sea millions of years before one group of mammals became whales
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A set of 58-million-year-old footprints suggest hippo-like mammals were living by the sea millions of years before one group of mammals became whales
Coprolites, or fossilised faeces, have always been slippery customers. But now we can use X-rays to see inside them, they are yielding fresh insights into ancient ecosystems