Prothonotary Warblers migrate to Central and South America during the winter. Even though these warblers are labeled as a species of least concern by IUCN, their local breeding populations are in danger. Because Prothonotary Warblers have specific habitat requirements, they are extremely susceptible to habitat loss.

Calvert County Natural Resources has installed nest boxes locally to provide breeding habitat for this cavity nesting species. Annually, during the nesting season we monitor the boxes to collect data for the Cornell Lab of Ornithology’s NestWatch.

This program is funded by Calvert County Natural Resources with support from the Calvert Nature Society.