<Li> T. m. propinquus breeds from southeast British Columbia, southern Alberta, southwest Saskatchewan south to southern California and northern Baja California . It winters throughout much of the southern breeding range and south to Baja California . It is the same size as or slightly larger than nominate T. m. migratorius, but paler and tinged more heavily brownish - gray . It has very little white on the tip of the outermost tail feather . Some birds, probably females, lack almost any red below . Males are usually darker and may show pale or whitish sides to the head . </Li> <Li> T. m. confinis breeds above 1,000 m (3,300 ft) in the highlands of southern Baja California . This form is particularly distinctive, with pale gray - brown underparts . It is relatively small, and the palest subspecies, with uniform pale gray - brown on the head, face and upperparts . It usually lacks any white spots to the tips of the outer tail feathers, which have white edges . It is sometimes classed as a separate species, the San Lucas robin, but the American Ornithologists' Union regards it as only a subspecies, albeit in a different group from the other races . </Li> <Li> T. m. phillipsi is resident in Mexico south to central Oaxaca . It is slightly smaller than propinquus but has a larger bill; the male's underparts are less brick - red than the nominate subspecies, and have a rustier tone . </Li> <P> The nominate subspecies of the American robin is 23 to 28 cm (9.1 to 11.0 in) long with a wingspan ranging from 31 to 41 cm (12 to 16 in), with similar size ranges across all races . The species averages about 77 g (2.7 oz) in weight, with males ranging from 72 to 94 g (2.5 to 3.3 oz) and females ranging from 59 to 91 g (2.1 to 3.2 oz). Among standard measurements, the wing chord is 11.5 to 14.5 cm (4.5 to 5.7 in), the culmen is 1.8 to 2.2 cm (0.71 to 0.87 in) and the tarsus is 2.9 to 3.3 cm (1.1 to 1.3 in). The head varies from jet black to gray, with white eye arcs and white supercilia . The throat is white with black streaks, and the belly and undertail coverts are white . The robin has a brown back and a reddish - orange breast, varying from a rich red maroon to peachy orange . The bill is mainly yellow with a variably dark tip, the dusky area becoming more extensive in winter, and the legs and feet are brown . </P>

How many robin birds are there in the world