26. Ice Worm
Ice worms, Mesenchytraeus solifugus, are small, dark-colored worms inhabiting glaciers in Alaska and the Pacific Northwest. They thrive in temperatures around 0°C (32°F) and are most active during the summer months. However, they cannot survive temperatures above 5°C (41°F); exposure to such warmth causes their bodies to “melt” due to the breakdown of cellular structures. For more information, see National Park Service.