When one creates a recording of the White-crowned sparrow
's song, but edits out the opening whistle, another White-crowned sparrow
will not learn this song.
Like most songbirds, Gambel's white-crowned sparrows
experience growth in the area of the brain that controls song output during the breeding season when a superior song helps them attract mates and define their territories.
For white-crowned sparrows
, at least part of the cue comes from the song's opening whistle, Soha says.
Seasonal changes in the reproductive system of the female White-crowned sparrow
, Zonotrichia gambelii, in captivity and in the field.
AN American white-crowned sparrow
was spotted in Dursey Sound, Co Cork - just the fourth ever in the British Isles.
The white-crowned sparrow
is sad that Poor JoJo missed his bus.
For example, scientists can sometimes tell which state a white-crowned sparrow
is from just by listening.
chlorurus exhibits differential migration distances among populations such as occurs in the White-crowned Sparrow
(Zonotrichia leucophrys) reported by Cortopassi & Mewaldt (1965).
In the White-crowned Sparrow
(Zonotrichia leucophrys), one of the few sparrow species in which dispersal has been thoroughly investigated, there is a nonsignificant tendency for females to disperse greater distances than males (Morton et al.
However, a male white-crowned sparrow
will act much more aggressively if it hears a bird of the same age singing in a territory it claims as its own.
In studies of species that are dichromatic with regard to age but not sex, Rohwer (1985) showed that dyed immature Harris' sparrows (Zonotrichia querula) dominated other immatures, Parsons and Baptista (1980) increased white-crowned sparrow
dominance by plucking the immature birds' crowns and reintroducing them with new adult feathers to adults, and Fugle, et al.
Genetic similarities between subspecies of the white-crowned sparrow
For the study, Dr David Luther of the University of Maryland and Dr Luis Baptista of the California Academy of Sciences examined three adjacent dialects of the native White-crowned Sparrow
over a 30-year period, from the late 1960's to 1998.
Also along the trail, a white-crowned sparrow
, its head striped like a tiny watermelon, serenaded us from its perch atop a bush.
Conversely, 21 species occurred after 1950 that had not been reported prior to that year: green-winged teal, northern pintail, greater scaup, common goldeneye, red-breasted merganser, golden eagle, gyrfalcon, black-bellied plover, ruddy turnstone, sanderling, least sandpiper, white-rumped sandpiper, Thayer's gull, Iceland gull, glaucous gull, American robin, northern wheatear, yellow-rumped warbler, blackpoll warbler, Harris's sparrow, and white-crowned sparrow