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Mountain bluebirds are fairly common, but populations declined by about 26% between 1966 and 2014, according to the North American Breeding Bird Survey. Partners in Flight estimates the global breeding population of 4.6 million, with 80% spending some part of the year in the U.S., 20% breeding in Canada, and 31% wintering in Mexico.
Bluebirds will also eat raisins soaked in water. In addition, in winter bluebirds use backyard heated birdbaths. By the 1970s, bluebird numbers had declined by estimates ranging to 70% due to unsuccessful competition with house sparrows and starlings , both introduced species , for nesting cavities, coupled with a decline in habitat.
Adult female in Livermore, California. The western bluebird is a small stocky bird with a length of 15 to 18 cm (5.9 to 7.1 in). The adult male is bright blue on top and on the throat with an orange breast and sides, a brownish patch on back, and a gray belly and undertail coverts.
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Unless otherwise noted, all the species on this list are considered to occur regularly in the park as permanent residents, summer or winter visitors, or migrants. The tags below are used to designate the abundance of some species. Because the NPS checklist notes abundance by season, the tag for the highest abundance of the year is used.
When farmers markets close for the season and the weather dips below freezing, we often turn to frozen vegetables and fruits to bridge the gap until our gardens are in full bloom again. Still ...
Winter can seem like a real downer after the beginning of the new year; there are no major holidays around the corner, the weather is bleak, and hearty stews have started to feel a bit boring.
Eastern bluebirds measure 16–21 cm (6.3–8.3 in) long, span 25–32 cm (9.8–12.6 in) across the wings, and weigh 27–34 g (0.95–1.20 oz). [12] [11] Male bluebirds have a bright head, back, and wings. Their breast is a brownish red. [12] Females are lighter with gray on the head and back and some blue on their wings and tail.