Field Notes · Catnum 240051 · score 18 — high uncertainty
May 31: 17:43 AM 8" up 4 eggs 2CBII in locusts island just E of dee, low growth pen, cleared channel at N side / island. June 7: 10:02 AM 4 warm eggs 2CB4 removed shell egg and added three Redwing eggs from 70-51 (25.03 x 17.00, 24.75 x 17.33, 26.40 x 17.46) 11:33 AM just one hatched egg. 6/3: c. 10:04 AM empty. 6/4: c. 10:20 7 m same. [23.96 x 18.43, A 24.28 x 18.72 B 23.98 x 17.76 3 embryos present.]
Metadata · Catnum 240051
Date02 Jun 1970
LocalityNew Haven, Connecticut, USA
CollectorRothstein, Steve
Eggs in Set4
Specimen TypeE
Incubationunknown
Identificationunknown
Nest Height0.2 m (8 inches)
Nest Supportlocusts
Near Waternear water
Nest Settingisland just E of dee, low growth pen, cleared channel at N side
Nest NotesNest was experimentally manipulated - original catbird eggs were removed and replaced with Red-winged Blackbird eggs from another collection (70-51). One egg hatched by June 7, nest was empty by June 3-4.
Further Details70-52
✦ Anecdote
This record documents an experimental cross-fostering attempt where Gray Catbird eggs were removed and replaced with Red-winged Blackbird eggs from another nest collection, making this an unusual scientific manipulation rather than a natural observation.