Field Notes · Catnum 165728 · score 5 — moderate uncertainty
Nest: 16 ft. up in big red maple by fence just outside woods, placed in a hole in trunk 6"x5" in diameter x 9" in depth, nest sunken to level with entrance. Compactly made of grass stems & stalks & mud, lined with dry grass blades quite thickly. Size 4 3/4"x3 3/4"; 3"x2 1/2". Well cupped, rim muddy.
Metadata · Catnum 165728
Date06 May 1914
LocalityFrankford, Philadelphia, Pennsylvania, USA
Coordinates40.031952, -75.105994 ↗ map
CollectorMiller, Richard F.
Eggs in Set3
Specimen TypeE
Incubationcommenced (transcribed as “started”)
Identificationbird seen (transcribed as “by crying female”)
Nest Height4.88 m (16 feet)
Nest Supportred maple
Nest Materialsgrass stems, stalks, mud
Nest Liningdry grass blades
Nest Settingby fence just outside woods
Nest NotesPlaced in a hole in trunk 6"x5" in diameter x 9" in depth, nest sunken to level with entrance. Compactly made. Size 4 3/4"x3 3/4"; 3"x2 1/2". Well cupped, rim muddy.
HeaderCollection of Richard F. Miller, Philadelphia, Penna.
Further Details761 | 177
✦ Anecdote
This is highly unusual because American Robins typically build their nests in forks of branches or on horizontal supports, but this nest was found in a tree cavity, which is extremely atypical nesting behavior for this species.