beambird

from The Century Dictionary.

• noun A name sometimes given to the spotted flycatcher, Muscicapa grisola, because it often builds its nest on the projecting end of a beam or rafter in a building.
• noun A provincial name for the petty-chaps or garden-warbler, Sylvia hortensis.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Zoöl.) A small European flycatcher (Muscicapa grisola), so called because it often nests on a beam in a building.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun zoology A small European flycatcher, Muscicapa gricola, that often nests on a beam in a building.