Bone microstructure supports a Mesozoic origin for a semiaquatic burrowing lifestyle in monotremes (Mammalia)
Suzanne J. Hand, Laura A. B. Wilson, Camilo López-Aguirre, Alexandra Houssaye, Michael Archer, Joseph J. Bevitt, Alistair R. Evans, Amalia Y. Halim, Tzong Hung, Thomas H. Rich, Patricia Vickers-Rich, Robin M. D. Beck.
PNAS