Wednesday, August 18, 2010

Warbler Guy, which wood-warblers use cavities for nests?

Only two of our North American breeding wood-warblers use a cavity nest: Prothonotary (above photo) and Lucy’s.

Prothonotary nests usually occur in stumps and snags either standing in or near water. An old or abandoned woodpecker hole is typically employed, most often one previously occupied by a Downy Woodpecker or Black-capped/Carolina Chickadee. Nest heights range from 2 to 12 feet above ground or water, with an average of 5 feet in height. Prothonotaries occasionally nest in bird boxes and near buildings.

Lucy’s Warbler is the only cavity nesting warbler in the western USA. This species usually places its nest in four types of cavities: natural cavities in trees (usually mesquite) where the entrance is in a sheltered spot; under loose bark; in abandoned woodpecker holes (especially those of Gila Woodpecker (Melanerpes uropygialis) in saguaros [Carnegiea gigantean] or other trees); and in deserted Verdin (Auriparus flaviceps) nests. Lucy's Warbler occasionally nests in holes in banks, in soap tree yucca leaves (Yucca elata), elderberry (Sambucus mexicana), sycamore (Platanus spp.), or willow/

Lucy's Warbler rarely nests in burrows or depressions in river banks, rocky crevices, deserted thrasher (Toxostoma sp.) and Cliff Swallow (Hirundo pyrrhonota) nests, "pseudocavity" evacuated in mass of debris in tamarisk, or forks in small branches.

Wednesday, August 4, 2010

Warbler Guy, were any changes in warbler names recently applied?

Yes, David (in Topeka, KS), the 51st supplement to the AOU Checklist of North American Birds includes changes to warblers names, but mostly due to the creation of new genera.

The new supplement includes the following changes:

• Blue-winged Warbler Vermivora cyanoptera
Formerly Vermivora pinus
• Tennessee Warbler Oreothlypis peregrina
Formerly Vermivora peregrina
• Orange-crowned Warbler Oreothlypis celata
Formerly Vermivora celata
• Nashville Warbler Oreothlypis ruficapilla
Formerly Vermivora ruficapilla
• Virginia’s Warbler Oreothlypis virginiae
Formerly Vermivora virginiae
• Colima Warbler Oreothlypis crissalis
Formerly Vermivora crissalis
• Lucy’s Warbler Oreothlypis luciae
Formerly Vermivora luciae
• Northern Waterthrush Parkesia noveboracensis
Formerly Seiurus noveboracensis
• Louisiana Waterthrush Parkesia motacilla
Formerly Seiurus motacilla