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The research that Tuttle focused on during her undergraduate work began with the white-throated sparrow alongside Doug Fraser and at the CLBS. Her later graduate and post-doctoral studies would expand to the subjects of sexual selection and reproductive trade-offs. This led into how the process of sperm competition functions in birds.
Close-up of a white-throated sparrow head, with bright white throat and yellow lore White-throated sparrows prefer to forage on the ground. The white-throated sparrow (Zonotrichia albicollis) is a passerine bird of the New World sparrow family Passerellidae. It breeds in northern North America and winters in the southern United States.
These birds have brown backs streaked with black, and distinctive head markings. Their cup nests, built by the female, are of plant material lined with fine grasses and constructed on the ground, low in a tree or bush, or in a niche in a wall. The female lays brown-blotched greenish-blue or greenish white eggs, which she incubates for 12–14 days.
It is a sister species with, and very closely related to, the white-crowned sparrow; studies of mitochondrial DNA show the two evolved into separate species very recently in geologic time. The white-throated sparrow is a slightly more distant relative. [4] Hybridization with both white-crowned and white-throated sparrows has been reported. [3]
The white-crowned sparrow is a very rare vagrant to western Europe. [5] It has been sighted in England, Scotland, [5] [6] Ireland, [7] and Norway. [8] In 2008 a white-crowned sparrow was spotted in Cley next the Sea in Norfolk, England. [9] To commemorate the event an image of the bird was included in a window at St Margaret's Church.
The house sparrow (Passer domesticus) is a bird of the sparrow family Passeridae, found in most parts of the world. It is a small bird that has a typical length of 16 cm (6.3 in) and a mass of 24–39.5 g (0.85–1.39 oz). Females and young birds are coloured pale brown and grey, and males have brighter black, white, and brown markings.
White-crowned sparrow, Zonotrichia leucophrys (R*) Golden-crowned sparrow, Zonotrichia atricapilla (R) Harris's sparrow, Zonotrichia querula (R) White-throated sparrow, Zonotrichia albicollis; Vesper sparrow, Pooecetes gramineus; LeConte's sparrow, Ammospiza leconteii (R) Seaside sparrow, Ammospiza maritima; Nelson's sparrow, Ammospiza nelsoni
House sparrow. Order: Passeriformes Family: Passeridae. Old World sparrows are small passerine birds. In general, sparrows tend to be small plump brownish or grayish birds with short tails and short powerful beaks. Sparrows are seed eaters, but they also consume small insects. House sparrow, Passer domesticus (I)