Disease outbreak cuts Wyoming, Yellowstone wolf numbers to lowest level since reintroduction era

A disease outbreak significantly reduced wolf numbers in Wyoming and Yellowstone National Park last year. Biologists report the lowest wolf population in 20 years, with canine distemper as the likely cause. This virus is especially lethal to wolf pups, with only 37% surviving the year. The outbreak affected 64% of wolves in northwestern Wyoming. Despite past outbreaks occurring when populations were high, this one happened with lower numbers, prompting further investigation. Wyoming’s wolf population fell by 23%, with a 42% drop in breeding pairs. Officials remain hopeful for recovery, citing increased resistance among surviving wolves.