Muskrats are a bellwether for a drying delta

Downstream of hydroelectric dams and Alberta's oil sands, one of the world's largest freshwater deltas is drying out. New research suggests long-term drying is making it harder for muskrats to recover from massive die-offs. It's a sign of threats to come for many other species.

source https://www.sciencedaily.com/releases/2021/07/210702114531.htm