Researchers were able to partially sequence seven proteins from a 23-million-year-old extinct rhino species, Epiaceratherium itjilik, which integrates with genomic data to redefine its place in the rhino family tree.
Echidnas and another Australian oddityâthe semi-aquatic platypusâare believed to have evolved from a common ancestor called Kryoryctes cadburyi that lived in Australia more than 100m years ago.