by Carl Strang
As usual, the dossier begins with the paragraph that established the file in the mid-1980’s. In this case I didn’t have much to say because my experience with the species was limited. Since then, dated notes have appended observations that I felt added to my understanding of the species.
This species was relatively rare around my home town of Culver, Indiana. My first were a pair in my neighborhood in the town. The male sang from high in trees or TV aerials. His song began with a phrase much like the theme of the “Guestward Ho” TV series which was current then. That mnemonic has helped me recognize it elsewhere in Indiana as well as Pennsylvania and Illinois. They also have a loud “pick” call distinctive in quality from their close relative the cardinal. Foraging movements are slow, taking their time while visually searching for insects at mid to high elevations in trees. They are uncommon during the breeding season (though abundant in migration) in DuPage County, with occasional single pairs here and there in savannah-like forests. They are especially common for a couple of weeks during migration in May.
5MY87. First song of the year heard at Willowbrook Forest Preserve.
25JL87. Hartz Lake, Indiana: An adult male fed 10-15 feet up in saplings. Deliberate: about 10 seconds per perch, looking apparently over a radius of several feet, moving 2-5 feet between perches.
13SE87. A female was in a mixed flock with a red-eyed vireo, a Tennessee warbler, and several catbirds and robins.
7MY88. First song of the year, Culver, Indiana.
11MY88. A female was in Willowbrook Forest Preserve.
8MY89. I saw grosbeaks today and on May 6th at Willowbrook.
4MY99. First migrant noted at Willowbrook. Last observed there 14MY.
26AU99. First migrant noted at Willowbrook. Last one noted 29SE.
4SE99. A grosbeak in female plumage at Willowbrook produced “pick!” notes and bits of low-volume warbling song.
11JE00. Rose-breasted grosbeaks were in a diverse forest near Langlade, Wisconsin, associated with the Wolf River riparian edge and with savanna-like areas where trees were more scattered. Deciduous trees were abundant in those areas. Other birds in those habitats were least flycatcher, Baltimore oriole and black-throated blue warbler.
23-4SE00. Grosbeaks were numerous along the Prairie Path just east of Industrial Drive and bordering the West Chicago Prairie, in the hedge-like edges.
21MY08. Fullersburg Woods. A rose-breasted grosbeak nest was on Willow Island, midway along the east side. It was 10 feet up in the top of a buckthorn, 15 feet in from the trail, female incubating. The nest structure resembles that of the cardinal but thinner so you can see through it in places.