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Kentucky Warbler Geothlypis formosa (Wilson, 1811) |
Birds |  Printer Friendly Version (PDF) |
Family: Wood-Warblers (Parulidae)
State Protection: Protected Bird 
Defined as a Protected Bird by New York State law. This species may not be hunted or taken at any time in New York. Federal Protection: Migratory Bird Treaty Act
The Migratory Bird Treaty Act implements various treaties and
conventions between the U. S. and Canada, Japan, Mexico and the former
Soviet Union for the protection of migratory birds. Under this Act,
taking, killing, or possessing migratory birds, including nests or eggs,
is unlawful unless specifically permitted by other regulations. State Rarity Rank: S2B
A State Rarity Rank of S2B means: Typically 6 to 20 breeding occurrences or very limited breeding acreage in New York State. Global Rarity Rank: G5
A Global Rarity Rank of G5 means: Demonstrably secure globally, though it may be quite rare in parts of its range, especially at the periphery. Did you know? Gibbs (1988) found that unmated males sing more than five times as often as paired males. |
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| State Ranking Justification | [-] |
New York is the northern-most extent of the Kentucky Warbler range. During the second Breeding Bird Atlas (2000-2005), Kentucky Warblers were reported in 11 blocks, with six probable or confirmed breeding blocks (McGowan and Corwin 2008). In contrast, the first Breeding Bird Atlas (1980-1985) reported Kentucky Warblers in 39 blocks, with 27 probable or confirmed breeding blocks (Andrle and Carroll 1988). When comparing the two breeding bird atlases, it appears the population is declining. Populations appear to fluctuate in the state.
| Short-term Trends | [-] |
When comparing the two breeding bird atlases, it appears the Kentucky Warbler population may now be declining. The first Breeding Bird Atlas (1980-1985) reported Kentucky Warblers in 39 blocks with 27 probable or confirmed breeding blocks (Andrle and Carroll 1988). A decline has been noted with the second Breeding Bird Atlas (2000-2005) with 11 blocks reported of which six were probable or confirmed breeding blocks (McGowan and Corwin 2008). Overall, Kentucky Warblers were reported from 72% fewer blocks during the second Breeding Bird Atlas (McGowan and Corwin 2008). Breeding Bird Survey data was not abundant enough to determine trends in New York (Sauer et al. 2007). With continued threats to its habitat in New York and its wintering grounds, the future status of this species in New York is not optimistic with predictions of possible extirpation (McGowan and Corwin 2008).
| Long-term Trends | [-] |
The peak population may have been in the 1870s when 16 individuals and four nests were found near Ossining in Westchester County (Andrle and Carroll 1988). Breeding was documented in Cortland County in 1903 and 1906 (Levine 1998). Soon after, Kentucky Warblers were absent from the state as a breeder for 30 to 40 years. The disappearance from New York is not understood (Andrle and Carroll 1988). During the 1950s, breeding Kentucky Warblers returned to the state and populations started to increase, but probably were not as high as they were in the late 1800s. This trend continued until the 1980s or 1990s. According to the second Breeding Bird Atlas, it appears that populations are once again declining in New York (McGowan and Corwin 2008).
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New York Natural Heritage Program. 2013. Online Conservation Guide for Geothlypis formosa. Available from: http://acris.nynhp.org/guide.php?id=7074. Accessed May 22nd, 2013. 
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