Language English Photo: Biodôme Photo: Biodôme Photo: Biodôme OngletsDescriptionDistinguishing featuresThis sparrow has a black spot on its unstreaked breast. It has a reddish brown cap. Its upper mandible is dark and the lower one is yellow. There are two white bars on each wing. The male and female are similar in appearance. ReproductionThe female builds a nest on the ground or sometimes in a shrub or tree, rarely more than 1.5 m off the ground. She produces a single clutch of 3 to 5 eggs, incubating them for 10 to 13 days. Both parents feed the nestlings. They leave the nest after 8 to 10 days. The species is monogamous. DietAmerican tree sparrows eat seeds almost exclusively during autumn, winter and spring. The stomach of a single bird was once found to contain 982 seeds. During the nesting period, they may eat insects and sometimes flowers and fruit. PredatorsTheir enemies of the adults are shrikes and diurnal raptors (sparrowhawks, falcons and kestrels). Blue jays, racoons and snakes may eat the eggs. HabitatIn summer, they live in forested and shrub tundra and wooded lichen heaths. They are found in Alaska, Yukon and northern Canada. They winter from southern Canada (southernmost part of Québec) to the mideastern United States. They nest in the subarctic. Ecology, behaviourThey are not particularly aggressive toward individuals of other species that venture into their territory. Intruders may be chased away, however, if they get too close to the nest. Birds in this species are commonly seen at birdfeeders. French nameBruant hudsonien Scientific nameSpizella arboreaPhylumChordataClassBirdsOrderPasseriformesFamilyFringillidaeSizeLength: 14.5 to 16.4 cmWeightApprox. 20 gLife spanRecord: 10 years 9 monthsStatusLeast Concern (IUCN). Common migratory species.