Eastern Wood-Pewee

The eastern wood pewee (''Contopus virens'') is a small tyrant flycatcher from North America. This bird and the western wood pewee (''C. sordidulus'') were formerly considered a single species. The two species are virtually identical in appearance, and can be distinguished most easily by their calls.

Taxonomy

In 1760 the French zoologist Mathurin Jacques Brisson included a description of the eastern wood pewee in his ''Ornithologie'' based on a specimen collected in the Carolinas. He used the French name ''Le gobe-mouche cendré de la Coroline'' and the Latin ''Muscicapa Carolinensis cinerea''. Although Brisson coined Latin names, these do not conform to the binomial system and are not recognised by the International Commission on Zoological Nomenclature. When in 1766 the Swedish naturalist Carl Linnaeus updated his ''Systema Naturae'' for the twelfth edition, he added 240 species that had been previously described by Brisson. One of these was the eastern wood pewee. Linnaeus included a brief description, coined the binomial name ''Muscicapa virens'' and cited Brisson's work. The specific name ''virens'' is Latin for "green". This species is now placed in the genus ''Contopus'' that was introduced by the German ornithologist Jean Cabanis in 1855. The species is monotypic.

Description

The eastern wood pewee is in length and weighs around . Wingspan ranges from 9.1-10.2 in (23-26 cm). The sexes are alike. The adult is gray-olive on the upperparts with light underparts, washed with olive on the breast. Each wing has two pale wing bars, and the primary remiges are long, giving the wingtip a slim and very pointed appearance. The upper part of the bill is dark, the lower part is yellowish. The songs are basically a mournful whistled ''pee-a'wee'' given in a series, which gave this bird its name, and a "pe-wee" with a rising note at the end.

The western wood pewee (''C. sordidulus'') is essentially indistinguishable visually. But its range is parapatric to the west of the eastern wood pewee and its song—a descending ''tsee-tsee-tsee-peeer''—is entirely different.

The eastern phoebe (''Sayornis phoebe'') is similar, particularly in the worn plumage after breeding. It always lacks clearly defined wingbars, however, and bobs its tail frequently. It has a shorter primary projection. The eastern phoebe is also present on the breeding grounds by March, while eastern wood pewees do not arrive until very late April and early May. The songs (''fee-bee, fee-bee'') and calls (''chip'') are quite different. The least flycatcher (''Empidonax minimus'') is quite similar to the eastern wood pewee in plumage, but has a bold eye ring and much shorter primary projection, appearing rather blunt-winged. It also has a shorter bill and is smaller overall. The songs (''che-bec, che-bec'') and calls (a sharp ''whit'') are very different.

Distribution and habitat

Their breeding habitat is deciduous, mixed woods, or pine plantations in eastern North America. They migrate to Central America, the Caribbean, and in the Andes region of northern South America. They feed on insects and other arthropods. Wood pewees wait on a perch at a middle height in a tree and fly out to catch prey in flight, sometimes hovering to pick it from vegetation.

Eastern wood pewees arrive relatively late on breeding grounds (e.g., 18 May to 5 June in southern Ontario). They are rarely seen on their breeding grounds before the last days of April further south. They migrate south at a more usual time, leaving sometimes in late August but most often in September. Migration times have stayed the same in the last 100 years. They migrate quickly for most of the journey, dispersing and moving at a slower speed when approaching breeding or wintering range. For example, in the Cayman Islands which are offshore the winter quarters, the species is only rarely and briefly encountered, but passes through on its way north as early as mid-late February.

Behaviour

Breeding

The eastern wood pewee makes an open cup nest made of grasses, bark, and lichen

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