Sean Crane / American Bison (Bison bison) mother and calf at sunrise, Yellowstone National Park, Wyoming

Sean Crane / Cheetah (Acinonyx jubatus) males stalking, Ol Pejeta Conservancy, Laikipia, Kenya

Sean Crane / Cheetah (Acinonyx jubatus) males and Burchell's Zebra (Equus burchellii) group in background, Ol Pejeta Conservancy, Laikipia, Kenya

Sean Crane / Gursky's Spectral Tarsier (Tarsius spectrumgurskyae) mother with young, Tangkoko Nature Reserve, Sulawesi, Indonesia

Sean Crane / Four O'clock Moth (Dysphania fenestrata) caterpillar on a leaf, Queensland, Australia

MYN / Mac Stone / Pink Lady Slipper (Cypripedium acaule) photographed in the mountains of South Carolina, Greenville County.

Doug Wechsler / Bald cypress (Taxodium distichum) and Water tupelo (Nyssa aquatica) swamp. Congaree National Park, SC, USA. April

Sean Crane / Brown-throated Three-toed Sloth (Bradypus variegatus) in tree showing fur covered in green algae, Pavones, Costa Rica

Sean Crane / White-tailed Deer (Odocoileus virginianus) female calling at male at night in winter, Farmington, Connecticut

Sean Crane / White-tailed Deer (Odocoileus virginianus) in winter forest, Farmington, Connecticut

Sean Crane / Black Bear (Ursus americanus) at night, Farmington, Connecticut

Sean Crane / White-tailed Deer (Odocoileus virginianus) at night, Farmington, Connecticut