Spotted towhee
Spotted towhee | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Class: | Aves |
Order: | Passeriformes |
Family: | Passerellidae |
Genus: | Pipilo |
Species: | P. maculatus
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Binomial name | |
Pipilo maculatus Swainson, 1827
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The spotted towhee (Pipilo maculatus) is a large
Individuals in the Socorro Island population are much smaller than other spotted towhees, and show distinctive gray upper-parts. That population is sometimes treated as a species: the Socorro towhee (Pipilo socorroensis).
Description
Adult males have a generally darker head, upper body and tail with a white belly, rufous sides, white spots on their back and white wing bars. Females look similar but are dark brown and grey instead of black. The spotted towhee has white spots on its primary and secondary feathers; the Eastern towhee is the same bird in terms of its size and structure but does not have white spots.[3]
Distribution and habitat
The spotted towhee lives in dry upland forests,[5] open forests, brushy fields, and chaparrals. It breeds across north-western North America and is present year-round in California, Nevada, Arizona, Utah, Oregon, Washington, Idaho and southern British Columbia.[6] It is not found in arid climates and as a result does not reside in the Sonoran Desert, but resides in northern Arizona and the entirety of California except the southeast corner that borders Arizona. It has also been known to expand as far eastward as western Iowa and southwestern Minnesota. It also occurs in fringe wetland forests and riparian forests near the border of upland forests.[5] Because the spotted towhee's habitat overlaps with areas of the United States that experience regular forest fires (Arizona, New Mexico, California), it tends to be found in unburned chaparral and avoids chaparral and forests which have been burned[7][8] due to lack of ground cover and minimal foraging ability. Spotted towhees will be present in an area that is recovering after a burn (less than 15 years old),[9] due to excellent ground cover and ease of ground foraging from the recovering understory vegetation,[7] although populations will decrease after a forest fire until the vegetation has grown back.[10]
Its breeding habitat in the southwest is largely dependent on
Behavior
Breeding and nesting
They nest either on the ground or low in bushes, seldom more than 1.5 m (4.9 ft) above the ground[12] and most nests are around 40 cm (1.3 ft) above the ground.[13] The location for the nests is usually found in exposed areas, but conceal the nest as it is being built.[14] The female builds the nest over a period of about five days. It is bulky and sturdily made of leaves, strips of bark, twigs, forb stalks, and grasses, lined with pine needles, shredded bark, grass, and sometimes hair. It is usually 4.5 in (11 cm) in diameter with an inner ring of 2.5 in (6.4 cm) to 4 in (10 cm). The nests are built so the rim is at ground level and the nest is 2.5 in (6.4 cm) deep.
At least two broods, consisting of three to five eggs, are laid per season. The egg shells are grayish or creamy-white, sometimes with a tinge of green, with reddish brown spots that can form a wreath or cap. The eggs are slightly oblong, with their dimensions being 2 cm (0.79 in) to 2.6 cm (1.0 in) long and 1.7 cm (0.67 in) to 1.9 cm (0.75 in) wide. The female incubates the eggs alone for 12 to 14 days; the young leave the nest at 10 to 12 days. Nests are parasitized by cowbirds.
Diet
These birds forage on the ground or in low vegetation, They will frequent bird feeders if present in their woodland habitat.
Threats
Their main predators in less developed areas are ground dwelling snakes because nests are built on the ground. There is a strong relationship between the number of snakes that a nest encounters and the lowered probability of young chicks fledgling.[11] In developed areas and habitat near urban development their main predators are household cats.[14]
References
- . Retrieved 12 November 2021.
- ^ JSTOR 4081708.
- ^ a b "Spotted towhee Identification". Cornell Lab of Ornithology.
- ^ "Spotted Towhee Identification, All About Birds, Cornell Lab of Ornithology". www.allaboutbirds.org. Retrieved 2020-09-30.
- ^ S2CID 84709085.
- ^ a b Ryder, J M. "Spotted Towhee". The Atlas of the Breeding Birds of British Columbia, 2008-2012. Retrieved 12 May 2019.
- ^ a b KATHRYN L. PURCELL; SCOTT L. STEPHENS (2005). "CHANGING FIRE REGIMES AND THE AVIFAUNA OF CALIFORNIA OAK WOODLANDS" (PDF). Studies in Avian Biology (30): 33–45.
- ^ CARL E. BOCK; WILLIAM M. BLOCK (2005). "Variation in Top-Down Control of Avian Reproductive Success across a Fragmentation Gradient" (PDF). Studies in Avian Biology (30): 14–32.
- .
- S2CID 86523703.
- ^ S2CID 43938282. Archived from the original(PDF) on 2019-04-17.
- ^ "Spotted Towhee Pipilo maculatus" (PDF). San Diego Natural History Museum. Retrieved 16 April 2019.
- JSTOR 40072320.
- ^ a b c d "Spotted towhee Life History". Cornell Lab or Ornithology.
External links
- Spotted towhee species account - Cornell Lab of Ornithology
- Spotted towhee - Pipilo maculatus - USGS Patuxent Bird Identification InfoCenter
- "Spotted towhee media". Internet Bird Collection.
- Spotted towhee photo gallery at VIREO (Drexel University)
- Interactive range map of Pipilo maculatus at IUCN Red List maps