Field Notes · Catnum 240063 · score 9 — moderate uncertainty
0830 replaced 4 catbird eggs with dummy cowbird eggs (one catbird egg left). 0945 - one catbird egg necessary. 6/1 - found 2 of the thrown-out dummy eggs near the Seawall, one under a picnic table, the other on gravel - both about 100 feet from catbird nest. These two numbered. 5/70 c. 7:00 PM 3 eggs were in nest.
Metadata · Catnum 240063
Date25 May 1969
LocalityNew Haven, Connecticut, USA
CollectorRothstein, Steve
Eggs in Set5
Specimen TypeE
Incubationunknown
Identificationunknown
Near Waternear water
Nest NotesExperimental manipulation involving replacement of catbird eggs with dummy cowbird eggs, with subsequent recovery of discarded dummy eggs near Seawall and picnic area.
Further Details69-314
✦ Anecdote
This record documents an experimental manipulation where researchers replaced catbird eggs with dummy cowbird eggs, then later tracked down the discarded dummy eggs that had been thrown from the nest, finding them scattered around a recreational area near a seawall.