Field Notes · Catnum 240053 · score 14 — high uncertainty
June 10 - c. 9:00 AM 4 eggs CB II. 5' up in laurels at NW corner, flat. 6/11 8:50 AM some removed, 3 eggs added replacing three eggs from 70-56 [24.60 x 17.77, 23.77 x 17.95, 23.48 x 18.24] are possibly 2 CB II c. 9:00 AM 2 RW eggs + CB egg c. 5:10 PM one CB egg - cold warm (is so warm that egg probably can get no colder). 6/13 9:18 AM some cold no bruises CB II [24.17 x 18.38, A 23.43 x 17.93, B 24.40 x 18.45 - two embryos present. One embryo from third egg damaged, it was a little smaller than the smaller of the two that are present]. 6/14 2:30 PM some no bruise warm, cold (possibly can get no colder).
Metadata · Catnum 240053
Date11 Jun 1970
LocalityNew Haven, Connecticut, USA
CollectorRothstein, Steve
Eggs in Set4
Specimen TypeE
Incubationadvanced
Identificationunknown
Nest Height1.52 m (5 feet)
Nest Supportlaurels
Nest NotesLocated at NW corner, flat nest position. Eggs were manipulated during study with some removed and replaced from another nest (70-56). Temperature monitoring conducted over multiple days with embryonic development observed.
Further Details240.053 | 70-57
✦ Anecdote
This record documents an unusual experimental manipulation where eggs were removed from the original nest and replaced with eggs from another nest (70-56), creating a mixed clutch that included both Catbird and Red-winged Blackbird eggs for comparative study.