Alder Flycatcher | |
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Scientific classification | |
Domain: | Eukaryota |
Kingdom: | Animalia |
Phylum: | Chordata |
Clade: | Dinosauria |
Class: | Aves |
Order: | Passeriformes |
Family: | Tyrannidae |
Genus: | Empidonax |
Species: | E. alnorum |
Binomial name | |
Empidonax alnorum Brewster, 1895 | |
The alder flycatcher (Empidonax alnorum) is a small insect-eating bird of the tyrant flycatcher family. The genus name Empidonax is from Ancient Greek empis, "gnat", and anax, "master". The specific alnorum is Latin and means "of the alders". [2]
E. alnorum is one of the larger Empidonax species, attaining a length of 13–17 cm (5.1–6.7 in), and a mass of 12–14 g (0.42–0.49 oz). [3] The wingspan ranges from 8.3–9.4 cm (3.3–3.7 in). [4] Upperparts of E. alnorum are dull greenish-olive. The crown is a slightly darker olive-green than the back. The throat is white, with a darker breast band. Thin white rings surround the eyes. The bill is wide and moderate in length, with pinkish or yellow-orange lower mandible and black upper mandible. Wings are generally black, with white wing bars and white edges of the innermost secondaries (tertials). Juveniles have brownish upperparts, yellow underparts, and yellowish brown or buff wingbars. [5]
E. alnorum is similar in appearance to the eastern wood-pewee (Contopus virens) and the eastern phoebe (Sayornis phoebe), as well as the nearly identical willow flycatcher (Empidonax traillii) but E. alnorum can be distinguished by its smaller size and upward tail flicking behavior. [3]
Birds in the genus Empidonax are notoriously hard to identify. [6] Novel approaches to identification have been employed to try and increase the accuracy of species identification of mist-netted individuals, such as using ratios of and differences between the measured lengths of various body parts, including wings and beaks. Vocalizations are often relied upon for identification to species in the field when birds cannot be manipulated by hand. [3]
The alder flycatcher is sibling species with the willow flycatcher (E. trailli). [3] The two species were grouped together as one species, the Traill's flycatcher, until 1973, when differences in vocalizations and habitat use lead to their acknowledgement as distinct species, which has since been supported by genetic data. [7] [8] A study analyzing the genetic makeup of 12 Empidonax species found that the Alder and Willow Flycatcher are each other's closest relatives. [9] The Tyrant flycatcher genus is closely related to the Wood-Pewee genus (Contopus), and a hybrid of the two genera was reported to have been caught in Idaho. [10]
The summer breeding range of the species covers most of Canada and Alaska, descending to a southernmost point in the northeastern United States. [3] In autumn, E. alnorum migrates south through the eastern United States, Mexico and Central America, wintering in the western range of South America.
In the summer breeding season, E. alnorum occupies wet, dense, shrubby thickets of alder (Alnus sp.), maple (Acer sp.), and birch (Betula sp.) at elevations below 1,300 ft (400 m). [3] During migration, the species occupies humid and semi-arid habitats, including forest edges and fields at elevations up to 2,500 ft (760 m). Early successional scrubby vegetation or woodland edges are preferred habitats in winter, particularly those near water and below 1,100 ft (340 m). [11]
The vocalizations of the alder flycatcher are very useful for its identification in the field. The song is a distinct "fee-bee-o"; birds have been observed to throw their heads back and shake their tails while singing. [8] There are a variety of calls generated by E. alnorum, the most common of which is a "pit" sound produced when foraging. Other calls include those associated with aggressive or territorial behavior, including "double-peak", "zwee-oo", and "wee-oo" calls, and those linked with excitement, such as a "kitter" call.
E. alnorum's diet is composed primarily of insects such as those from the Hymenoptera (sawflies, bees, wasps and ants), Coleoptera (beetles), Diptera (flies), Lepidoptera (butterflies and moths) and Orthoptera (locusts, grasshoppers and crickets) families. [12] Insects are captured during flight or gleaned from the foliage of trees. [3] In the winter, some birds will include fruit and seeds in their diet.
The alder flycatcher breeds in wet thickets of maple, alder and birch. [5] Nests are positioned low in bushes within shrubby thickets, and are cup-shaped, built loosely of vegetative materials such as grass, weeds, pieces of bark, and small twigs. [11] Strips of grass or bark can often be seen dangling from the bottom of the nest, and the inside is lined with soft materials such as plant down. Females primarily engage in nest building activities.
Male E. alnorum vocalize to defend their breeding territory. As the species has not been extensively studied, courtship behavior is uncertain, but is believed to involve males chasing females through the trees.
3–4 eggs are laid per breeding season, and are creamy-white or buff in color and speckled with dark markings near the larger end of the egg. The female incubates the eggs for 12–14 days. Hatchlings are altricial and covered with tiny spots of olive-brown down. Both the male and female are involved in caring for the young. Juveniles take their first flight around 13–14 days of age.
E. alnorum is a species of least concern according to the IUCN Redlist. [5] Population numbers are stable in the United States, but have declined in Canada by approximately 44% in the period 1966–2014. The species has a rating of 9 out of 20 on the Continental Concern Score, [13] and is a U.S.-Canada Stewardship species.
The Altamira oriole is a New World oriole. The bird is widespread in subtropical lowlands of the Mexican Gulf Coast and northern Central America, the Pacific coast and inland. They have since spread to southern Texas, but this was not until 1939.
The grey-cheeked thrush is a medium-sized thrush. This species is 15–17 cm (5.9–6.7 in) in length, and has the white-dark-white underwing pattern characteristic of Catharus thrushes. It is a member of a close-knit group of migrant species together with the veery and Bicknell's thrush; it forms a cryptic species pair with the latter. The grey-cheeked thrush is all but indistinguishable from Bicknell's thrush except by its slightly larger size and different song. The two were formerly considered conspecific. Of all the American spotted thrushes, the grey-cheeked has the most northern breeding range.
The eastern phoebe is a small passerine bird. The genus name Sayornis is constructed from the specific part of Charles Lucien Bonaparte's name for Say's phoebe, Muscicapa saya, and Ancient Greek ornis, "bird". Phoebe is an alternative name for the Roman moon-goddess Diana, but it may also have been chosen to imitate the bird's call.
The eastern kingbird is a large tyrant flycatcher native to the Americas. The bird is predominantly dark gray with white underbelly and pointed wings. Eastern kingbirds are conspicuous and are commonly found in open areas with scattered trees and bushes, where they perch while foraging for insects. The Eastern kingbird is migratory, with its breeding range spread across North America and its wintering range in Central and South America.
The eastern wood pewee is a small tyrant flycatcher from North America. This bird and the western wood pewee were formerly considered a single species. The two species are virtually identical in appearance, and can be distinguished most easily by their calls.
The western wood pewee is a small tyrant flycatcher. Adults are gray-olive on the upperparts with light underparts, washed with olive on the breast. They have two wing bars and a dark bill with yellow at the base of the lower mandible. This bird is very similar in appearance to the eastern wood pewee; the two birds were formerly considered to be one species. The call of C. sordidulus is a loud buzzy peeer; the song consists of three rapid descending tsees ending with a descending peeer.
The olive-sided flycatcher is a small to medium sized passerine bird in the family Tyrannidae, the Tyrant flycatcher family. It is a migratory species that travels from South to North America to breed during the summer. It is a very agile flyer and mainly consumes flying insects on flight. Since 2016, this species has been assessed as being near-threatened globally (IUCN) and threatened in Canada (SRA) due to its declining populations.
The yellow-bellied flycatcher is a small insect-eating bird of the tyrant flycatcher family.
The willow flycatcher is a small insect-eating, neotropical migrant bird of the tyrant flycatcher family native to North America.
The Acadian flycatcher is a small insect-eating bird of the tyrant flycatcher family.
Lincoln's sparrow is a small sparrow native to North America. It is a less common passerine bird that often stays hidden under thick ground cover, but can be distinguished by its sweet, wrenlike song. Lincoln's sparrow is one of three species in the genus Melospiza which also includes the song sparrow and the swamp sparrow. It lives in well-covered brushy habitats, often near water. This bird is poorly documented because of its secretive nature and breeding habits solely in boreal regions.
The rock wren is a small songbird of the wren family native to western North America, Mexico and Central America. It is the only species in the genus Salpinctes.
The southern tropical pewee is a small passerine bird in the tyrant flycatcher family. It breeds from southern Brazil and Paraguay south to Argentina.
The vermilion flycatcher is a small passerine bird in the tyrant flycatcher family found throughout South America and southern North America. It is a striking exception among the generally drab Tyrannidae due to its vermilion-red coloration. The males have bright red crowns, chests, and underparts, with brownish wings and tails. Females lack the vivid red coloration and can be hard to identify—they may be confused for the Say's phoebe. The vermilion flycatcher's song is a pit pit pit pidddrrrreeedrr, which is variable and important in establishing a territory. Riparian habitats and semi-open environments are preferred. As aerial insectivores, they catch their prey while flying. Their several months-long molt begins in summer.
Couch's kingbird is a passerine tyrant flycatcher of the kingbird genus. It is found from southern Texas along the Gulf Coast to the Yucatán Peninsula in Mexico, Belize and northern Guatemala. It is also found in the lower stretches of the Rio Grande Valley.
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The American gray flycatcher, or American grey flycatcher, or just gray flycatcher as it is known in North America, is a small, insectivorous passerine in the tyrant flycatcher family. It is common in the arid regions of western North America, especially the Great Basin. From sagebrush steppes to pinyon-juniper woodlands and ponderosa pine forests, this flycatcher forages for insects from shrubs or low tree branches.
The Cuban pewee or crescent-eyed pewee is a species of bird in the family Tyrannidae. It is found in Cuba and the northern Bahamas. It was formerly lumped with the Hispaniolan pewee and Jamaican pewee as a single species, the Greater Antillean pewee.
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