carolina wren eggs hatch in 12 -- 16 days.
how long for carolina wren eggs to hatch?
12 -- 16 days
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brood parasitism by the brown-headed cowbird is common, with up to 25% of carolina wren nests being affected in certain regions such as oklahoma and alabama. cowbird parasitism peaks in april at 41%, and is as low as 8% and 0% in july and august, respectively. female cowbirds sometimes eject carolina wren eggs before laying their own, and even if host eggs are retained, the size of cowbird eggs negatively affect the hatching success of wren eggs. as a result, cowbirds may have a significant impact on the reproductive success of wrens. the feeding rate for cowbird nestlings is higher than wren feeding rates, and some have been raised to independence. this also can be detrimental to the survival of wren nestlings. a rare instance of brood-parasitism by a house finch has been recorded. the rate of brood parasitism is thought to be lower in more natural and concealed nesting locations. body parasites such as the larvae of blowflies feed on nestlings and the blood loss weakens nestlings. fellow species of wren such as bewick's wren and the winter wren compete for nesting locations and food, respectively.
carolina wren