Description: A daily photo highlight from Smithsonian collections. [caption id="" align="aligncenter" width="412" caption="In the Hall of Mammals, National Museum of Natural History in an exhibit case of "Poisonous Mammals" displays the short-tailed shrew, the duck-billed platypus, and the spiny anteater, the only poisonous mammals, 1959, by Unknown photographer, Photographic print,
Description: [caption id="" align="aligncenter" width="408" caption="The skeleton of a Hyracotherium, a tiny horse that heralded one of the major evolutionary trends of the age of mammals - the move to grazing - from the National Museum of Natural History's new exhibit "Mammals in the Limelight," opening May 30, 1985, In the background is Robert Emry, Curator of fossil mammals in the