Water rails are secretive wetland birds vulnerable to reedbed drainage and hard winters that reduce invertebrate prey in frozen margins.
Prolonged freezing conditions prevent access to invertebrate prey causing starvation. Reedbed drainage removes the muddy margins essential for foraging. Predation by mink on nesting birds has increased in degraded habitats. Water rails disturbed from reeds become exposed to aerial and terrestrial predators. Hard frost kills the aquatic invertebrates they depend on for several weeks.