Marmots are emerging from hibernation on average 23 days earlier than 23 years ago. This coincides with an increase in average May temperatures of about 1.8°F (1°C) over the same time period.
Reference: Inouye, D.W. et al., 2000. Climate change is affecting altitudinal migrants and hibernating species. Proceedings of the National Academy of Sciences, 97, 4: 1630-1633.
