James and others (1983) reported recovering 15 nestling White-crowned Sparrows
(Zonothrichia leucophrys) from 9 of 39 Western Terrestrial Garter Snakes they examined near San Francisco, California.
These Fragstats and compositional metrics were chosen post hoc based on characteristics of habitat use of the species (American tree sparrow Spizella arborea and white-crowned sparrow
Zonotrichia leucophrys) included in our post hoc analyses (Norment 1993, King and Savidge 1995, Delisle and Savidge 1997, Hovick et al.
For example, the White-crowned sparrow
's (Zonotrichia leucophrys) song always begins with one or two distinctive whistles.
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.
Birds/[km.sup.2] (mean [+ or -] SE) Shorebirds: American golden-plover 0.1 [+ or -] 0.1 Semipalmated plover 0.6 [+ or -] 0.3 Semipalmated sandpiper 2.2 [+ or -] 0.7 Least sandpiper 0.3 [+ or -] 0.2 Dunlin 0.3 [+ or -] 0.2 Wilson's snipe 0.6 [+ or -] 0.3 Songbirds: Horned lark 4.9 [+ or -] 0.9 American pipit 11.1 [+ or -] 1.5 American tree sparrow 7.6 [+ or -] 1.5 Savannah sparrow 6.4 [+ or -] 1.3 White-crowned sparrow
2.7 [+ or -] 0.7 Lapland longspur 30.7 [+ or -] 2.9 Snow bunting 0.7 [+ or -] 0.3 Common/hoary redpoll 0.4 [+ or -] 0.3 TABLE 3.
-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.
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.
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.
Song development in the white-crowned sparrow
: Social factors and sex differences.
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.