Facts about Cerulean Warbler

1. 08

   Young Cerulean Warblers fledge from their nests at approximately 8 to 10 days old, among the shortest nestling periods of any North American warbler species.

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2. 07

   Pair bonds in Cerulean Warblers typically last only one breeding season, with both males and females often selecting new mates in subsequent years across their migration cycle.

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3. 06

   Only about 1 percent of suitable Cerulean Warbler habitat remains in their South American wintering grounds due to extensive deforestation of Andean cloud forests.

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4. 05

   Males of this species produce a high-pitched, wheezy song consisting of four to six notes that ecologists use to locate and monitor breeding populations in eastern North American forests.

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5. 04

   Nesting Cerulean Warblers typically build their cup-shaped nests high in deciduous trees between 40 and 70 feet above ground, placing them on horizontal branches near the canopy.

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6. 03

   Cerulean Warblers migrate over 4,000 miles annually between North American breeding grounds and South American wintering territories in the Andes Mountains.

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7. 02

   The Cerulean Warbler's striking blue plumage is most vibrant in males during breeding season, making them easily distinguishable from other warbler species in North American forests.

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8. 01

   Declining populations of the Cerulean Warbler have dropped approximately 80 percent since the 1960s due to habitat loss in their breeding and wintering ranges.

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