October 24, 2016 – Cerulean Warbler (Setophaga cerulea)

Requested by: @mildlylively

Breeding in deciduous forests of the northeastern United States into Canada, these warblers winter in parts of northwestern South America. Though the majority of their diet is insects, they eat some plant foods in the winter, joining mixed-species flocks with tropical tanagers and other birds. They build their nests in the mid- or upper-canopy from bark fiber, grass stems, hair, and spiderwebs. If their first nesting attempt fails, females often reuse spiderwebs from the old nest, while gathering new lining. Classified as Vulnerable by the IUCN, their population has declined by over 80% in the last 40 years, mostly due to habitat degradation.


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