STEPHEN J. KRASEMANN / SCIENCE PHOTO LIBRARY STEPHEN J. KRASEMANN / SCIENCE PHOTO LIBRARY
Two Barren Ground Caribou (Rangifer tarandus) bulls in prime condition crossing river and escaping insects. Members of the Porcupine Caribou Herd which migrates between the Arctic National Wildlife Refuge (ANWR) and Yukon, Canada.
Model release not required. Property release not required.