Carol Walker / A wild pinto mare with her blanket appaloosa yearling and buckskin filly, walking over grassland, Lost Creek, Wyoming, USA. August.
01741981
Carol Walker / A wild black curly stallion bowing his head, posturing at another stallion, Salt Wells Creek, Wyoming, USA. May.
01741980
Carol Walker / Two wild stallions fighting, a bay roan and a black stallion, Salt Wells Creek, Wyoming, USA. June.
01741979
Carol Walker / A wild red roan stallion rearing up as another stallion approaches, Salt Wells Creek, Wyoming, USA. May.
01741978
Carol Walker / Three wild stallions, two greys and a sorrel, standing in a group, Lost Creek, Wyoming, USA. July.
01741977
Carol Walker / Wild curly stallion posturing, portrait, Salt Wells Creek, Wyoming, USA. June.
01741976
Carol Walker / Wild Bay stallion leading his grey mare across grassland, Lost Creek, Wyoming, USA. July.
01739304
Joel Sartore / Photo Ark / Tracking shot of an American dog tick (Dermacentor variabilis) female, Lincoln, Nebraska, USA. Controlled conditions.
01739302
Joel Sartore / Photo Ark / Bartram's scrub-hairstreak (Strymon acis bartrami) moving its antennae, Pine Rocklands, Florida, USA. Controlled conditions.
01739299
Joel Sartore / Photo Ark / Northern tidewater goby (Eucyclogobius newberryi) female looking around, Vandenberg Space Force Base, California, USA. Controlled conditions.
01739297
Joel Sartore / Photo Ark / Northern tidewater goby (Eucyclogobius newberryi) females looking and moving gills, Vandenberg Space Force Base, California, USA. Controlled conditions.
01739284
Joel Sartore / Photo Ark / San Clemente loggerhead shrike (Lanius ludovicianus mearnsi) female looking around and vocalising, Stone Station, San Clemente Island, California, USA. Controlled conditions.