The image shows a female adding material, mostly liverwort from the bases of knees and trees, to her nest in a hollow cypress knee. Only the female builds the actual nest, usually over water, while the male will build several dummy nests. The pair remain monogomous.
Eggs laid in the nest cavity will hatch in 12-14 days and the young will fledge in another 11 days. The young can supposedly swim! Both parents will feed the young a diet of insects and snails. Prothonotary Warblers can be frequent victims of the parasitic Brown-headed Cowbird. The nest in the image would likely be safe due to the small opening in the knee, which would prevent the larger cowbird from entering and laying her egg. The Prothonotary Warblers at FBF are secure within the dense, old-growth swamp, while habitat loss and fragmentation elsewhere exposes Prothonotary Warblers and other birds to the parasitic cowbirds and their delinquent parenting.
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