Behavior
On the wintering grounds in Puerto Rico, Northern Waterthrushes leave daytime foraging areas and fly up to 2 kilometers to nighttime roosts. The roosts are often located in red mangrove habitats.
Northern Waterthrushes winter in 4 main habitats in Puerto Rico: white mangrove, red mangrove, black mangrove, and scrub. Males, which are larger and migrate earlier in spring, prefer to winter in white mangrove, and are able to maintain or gain weight through the winter. Females winter in the other drier and less food-rich habitats. Waterthrushes wintering red and black mangrove can maintain body weight through the winter but lose weight in scrub.
Read more about this topic: Northern Waterthrush
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