Field Notes · Catnum 240539 · score 32 — high uncertainty
June 19 c. 11:30 AM complete catbird nest on S. side of ditch. Strip in line with willows c. 280° E. parking spot. 6/23 10:01 AM one cold egg. 6/25 9:26 AM 3 warm to warm cold egg CB II [24.38 x 17.29 SIBLEY] 6/26 10:01 AM 3 eggs (c) no bruises CB II 6/27 9:56 AM same warm no bruises CB II 6/28 10:07 AM same warm no bruises CB II 6/29 3:19 PM same no bruises CB II 6/30 11:32 AM same warm dry no bruises July 1 10:01 AM same warm no bruises CB II 7/2 3:57 PM 3 eggs (c) + real cowbird egg 7/3 10:28 AM same warm neither CB egg has any bruise CB II 7/5 c. 9:35 AM same CB II no bruise 7/6 12:40 AM same CB II no bruise 7/8 1:06 PM 3 eggs (c) real CB egg gone CB II 7/9 c. 11:00 AM 2 eggs (c) no bruises two but possibly one CB II 7/10 10:13 AM same 2 CB II-III (at least 2 other CB appeared to but didn't scold) 7/11 10:43 AM same 2 CB II-II removed (c) 4 egg no bruises. Egg has no development. 7/17 4:16 PM see 2 large well feathered young one CB II other III
Metadata · Catnum 240539
Date25 Jun 1970
LocalityDelta, Manitoba, Canada
CollectorRothstein, Steve
Eggs in Set4
Specimen TypeE
Incubationunknown
Identificationunknown
Nest Supportwillows
Near Waternear water
Nest Settingditch area with willows
Nest NotesNest located on south side of ditch in line with willows, approximately 280° from parking spot. Nest was parasitized by cowbird. One catbird egg disappeared during observation period. Two well-feathered young observed on July 17.
Further DetailsWFVZ 240, 539 | 70-117
✦ Anecdote
This nest was parasitized by a Brown-headed Cowbird, and remarkably, one of the original catbird eggs mysteriously disappeared during the observation period, leaving only two catbird eggs that successfully hatched.