Ласка (Mustela nivalis campestris) at Nebraska Wildlife Rehab Center.

Featured species: A plains least weasel (Mustela nivalis campestris) at Nebraska Wildlife Rehab Center. This animal is in his winter coat of white. His coat will turn brown in the summer. To license this video, click here: Find out why this video has no sound: The National Geographic Photo Ark, led by photographer Joel Sartore, is a multiyear effort to document every species living in zoos and wildlife sanctuaries, inspire action through education, and help save wildlife by supporting on-the-ground conservation efforts. Explore the thousands of photos and videos in the Ark to find out more about wildlife around the world and the threats they face in the wild: Instagram: @joelsartore Facebook: @sartorephoto Website: