Jack Dykinga / Mulesears (Wyethia sp) flowers at dawn. on the hillsides in Coral Pink Dunes State Park, Utah, USA.

Jack Dykinga / Mulesears (Wyethia sp) at dawn flowering on hillsides in Coral Pink Dunes State Park, Utah, USA.

Donald M. Jones / Mule Deer (Odocoileus hemionus) fawn, Montana

Shattil & Rozinski / Mule ear (Wyethia sp) flowering in grassland, Wyoming, USA, North America

Michael Durham / Townsend's Big-eared Bat (Corynorhinus townsendii) male roosting on a rock, John Day Fossil Beds National Monument, Clarno Unit, Oregon

Tim Fitzharris / Mule Deer (Odocoileus hemionus) portrait, Washington

Tim Fitzharris / Meadow of Lupines and Mule's Ear Sunflowers, Crested Butte, Colorado