Field Notes · Catnum 240011 · score 34 — high uncertainty
May 23, 5:45 PM. SE of house on Road, 15 feet, 4 small elm with red top. 5 feet EVE elm, no C. Base 4.5 feet high, no cup formed but large foundation. 5/27 7:34 AM cowbird. June 4 - 7:07 AM, 4 warm eggs removed, all 4 put in 3 (C) + one C. Blended C. Box nest II 7:24 AM, 3 (C) + control in nest. 7:54 AM control in nest, 30 gone wild. 6:17 PM checked cold, no brown, released all 3 red eggs. 6/8 9:28 AM, 3 eggs, 0 cold damp, no hum, all eggs removed. 22.20 x 16.61 - A, 22.62 x 16.70 - B, 22.40 x 16.49 egg no let. Egg A had embryos present. Egg B had very small soupy embryo not present.
Metadata · Catnum 240011
Date04 Jun 1969
LocalityNew Haven, Connecticut, USA
CollectorRothstein, Steve
Eggs in Set4
Specimen TypeE
Incubationcommenced
Identificationunknown
Nest Height1.37 m (4.5 feet)
Nest Supportsmall elm
Nest Settingnear house on road
Nest NotesBase 4.5 feet high, no cup formed but large foundation. Cowbird parasitism observed. Experimental manipulation involving removal and replacement of eggs with controls. Final clutch of 3 eggs removed cold and damp.
HeaderColbird
Further Details240 011 | 69-309
✦ Anecdote
This record documents an unusual experimental study involving cowbird parasitism and controlled manipulation of eggs, with systematic removal and replacement of eggs with controls over multiple dates.