Pseudogymnoascus destructans is a fungus that causes a disease known as white-nose syndrome in bats. It thrives in cold, damp environments, particularly in caves where bats hibernate. The fungus appears as a white growth on the bats' noses and wings, leading to severe health issues. Infected bats often wake from hibernation prematurely, depleting their fat reserves and resulting in starvation. This disease has significantly impacted bat populations in North America, leading to declines in several species. Conservation efforts are ongoing to understand and manage the spread of Pseudogymnoascus destructans and protect affected bat species.