The fossil remains of small dinosaurs that burrowed into the ground have been found by scientists in Montana, US.The 95-million-year-old bones are from an adult and two juveniles and were unearthed in a chamber at the end of a 2.1m-long sediment-filled tunnel.
The researchers say the discovery is the first definitive evidence that some dinosaurs dug dens and cared for their young in such structures.
Details are reported in the journal Proceedings of the Royal Society B.
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