165-million-year-old fossil reveals ancient origins of how mammals drink milk

Researchers discovered fossil of a 165-million-year-old mammal relative in China that reveals how mammals developed ability to feed milk to their babies way before time of modern mammals. Megacauda sungei, a large mammaliaform living during Middle Jurassic Period, the ancient animal had bones linked to sucking and swallowing. Researchers believe it lived near freshwater and hunted small creatures.