Mexican Whip-poor-will
Antrostomus arizonae
Cryptic nightbird, more often heard than seen. Listen for namesake song, a whistled "whip-poor-WILL," repeated endlessly. Rolling and more trilled than Eastern Whip-poor-will song. Found in forests in foothills and canyons, often with a mixture of pines and deciduous trees, and open areas nearby for foraging. Forages at night from the ground for flying insects. Intricately patterned with gray, brown, and black. Similar to Common Poorwill but with longer tail, different voice, and different habitat. Eastern and Mexican Whip-poor-wills were recently split into separate species; they differ mainly in voice and do not overlap in range.
Identification
The Mexican whip-poor-will is 23 to 24 cm (9.1 to 9.4 in) long and weighs 45 to 50 g (1.6 to 1.8 oz). In general its upperparts are grayish brown with blackish brown streaks; the crown has wide blackish brown stripes. The throat and breast are blackish with a thin white band on the lower throat between them. The belly is buff with brown bars. The male's outermost three pairs of tail feathers have broad white tips; the female's are narrower and buffy. The wings are brown with tawny and buff spots and speckles. The subspecies differ somewhat. They are lighter in the north and darker in the south and there are variations in the tone of the body color (some are redder) and the size and shape of the spots and speckles.
Taxonomy
Until 2010 the Mexican whip-poor-will and what is now the eastern whip-poor-will (Antrostomus vociferus) were considered conspecific under the name whip-poor-will. They were separated based on differences in their genetics, morphology, and vocalizations. The two remain sister species and with the Puerto Rican nightjar (A. noctitherus) form a superspecies. The Mexican whip-poor-will has these five subspecies:
- Scientific name
- Antrostomus arizonae
- Authority
- Brewster, 1881
- Order
- Caprimulgiformes
- Family
- Caprimulgidae
- Genus
- Antrostomus
Range and habitat
The subspecies of the Mexican whip-poor-will are distributed thus:<p>A. a. arizonae inhabits several similar mid- to mid-upper elevation, semi-arid to moist, landscapes with the common features being oaks and pines. The habitat of the more southerly resident subspecies is poorly known but there too they are birds of forest and woodland.
- Breeding range
- NA : w USA s to Honduras
- Non-breeding range
- c Mexico s to Honduras
- Migration
- Complete migrants
Behavior
The behavior of the Mexican whip-poor-will has not been extensively studied but is assumed to be essentially the same as that of eastern whip-poor-will. That species is crepuscular and nocturnal, and roosts motionless during the day.<p>Mexican whip-poor-wills are assumed to forage like eastern whip-poor-wills by sallying from a tree perch and less frequently from the ground. The latter's prey is insects, with moths and beetles being the dominant types.<p>The Mexican whip-poor-will lays its clutch of two eggs directly on leaf litter with no conventional nest. In Arizona they are laid in May and early June; laying dates are not known elsewhere. Both male and female have a brood patch, which probably means that both sexes tend the eggs as do eastern whip-poor-wills.<p>The Mexican whip-poor-will is more often heard than seen. Its song is an onomatopoeic whip-poor-will like that of its eastern congener, but lower in pitch and "less 'snappy' and slightly 'lazier'". It also makes a variety of other sounds including "a single, low, mellow quirt or queerp note", a growl, and a "growl-chuck".
Conservation
- Population trend
- declining
Photos
Distribution
Bird Calls
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