Hammond’s Flycatcher

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Quick Facts

Migratory
  • Scientific Name: Empidonax hammondii
  • Spanish Name: Mosquero de Hammond
  • Family: Tyrannidae
  • Known Nicknames: Hammond's Flycatcher
  • Average Length: 12–14 cm / 4.7–5.5 in
  • Average Weight: 8–12 g / 0.28–0.42 oz
  • Wingspan: 20–23 cm / 7.9–9.1 in
  • Key Feature: Dark, olive-gray upperparts with a distinct white eye-ring and two whitish wing bars
  • Primary Diet: Insectivore
  • Range: Western North America (breeds from Alaska to California and Wyoming; winters from Mexico to Honduras)
  • Habitat: Mature coniferous and mixed forests, especially with tall trees and open understory
  • Social Structure: Solitary (except during migration and breeding)
  • Nesting/Breeding: Tree branches (cup-shaped nest placed on a horizontal limb or in a fork, often high in a conifer)
  • Conservation Status: Least Concern (LC)
  • Population Trend: Stable

The Hammond's Flycatcher (*Empidonax hammondii*) is a small, energetic songbird of western North American coniferous forests, renowned for being one of the most challenging birds to identify due to its near-identical appearance to other *Empidonax* species. A master of subtlety, this gray-olive flycatcher has a relatively large, blocky head, a short bill, and a pale, teardrop-shaped eye-ring that gives it a slightly "surprised" expression. Its most unique characteristic is a distinctive, rapid series of crisp "peep" and "pip" notes—a sharp, three-parted call that sounds like *seet-sit-sit*—which is often the best way to distinguish it from look-alikes like the Dusky or Pacific-slope Flycatcher. True to its family name, it hunts by sallying from a high, exposed perch to snatch insects mid-air, then returns to the same spot, a behavior that showcases its remarkable aerial agility in the dappled light of its mountain habitat.

Fun Facts

Despite its drab appearance, the Hammond's Flycatcher is a master of aerial deception. It performs a unique "hover-glean," fluttering in place to pluck insects from the underside of leaves, a behavior that saves energy compared to constant chasing. It also has an incredibly high-pitched, buzzy song so thin that many humans over 40 cannot hear it, allowing males to establish territories without attracting mammalian predators. Furthermore, it is one of the few flycatchers to regularly nest in conifers, often building its cup nest directly against the trunk of a pine or fir, a strategy that provides excellent camouflage from hawks above.

Habitats & Distribution

The Hammond's Flycatcher primarily inhabits mature coniferous and mixed coniferous-deciduous forests, favoring areas with tall, dense canopy cover such as those dominated by Douglas-fir, spruce, or pine. It is often found in montane regions, including the interior of large forest stands, and tends to avoid edges or open woodlands, preferring the shaded understory of older-growth forests. Its breeding range extends across western North America, from southeastern Alaska and central British Columbia south through the Cascade and Rocky Mountain ranges to northern California, Arizona, and New Mexico. During winter, it migrates to higher-elevation forests in Mexico and Central America, with some populations reaching as far south as Honduras.

Behaviours & Reproduction

Hammond's Flycatcher is a solitary and highly territorial species, especially during the breeding season. Males establish and defend a nesting territory through persistent singing from prominent perches, often engaging in aerial chases with intruders. Their courtship involves the male performing short, fluttering flights and wing-quivering displays near the female, followed by a brief chase before copulation. The species is socially monogamous, with pairs forming for a single breeding season, though no long-term pair bonds persist. Nesting is the female's primary responsibility; she builds a compact, cup-shaped nest of grasses, moss, and lichens, typically placed high in a conifer against the trunk or on a horizontal branch. She alone incubates the clutch of 3-4 eggs for about 14-15 days. A unique reproductive strategy is their remarkable fidelity to specific nest sites: individuals often return to the same territory and even the same tree or branch in consecutive years. After hatching, both parents feed the nestlings, which fledge after roughly 15-17 days, but the male may continue to feed the fledglings while the female begins a second brood in some parts of their range.

Diet

The Hammond's Flycatcher is an almost exclusively insectivorous bird, relying on a diet composed primarily of small flying insects such as flies, moths, beetles, wasps, and leafhoppers. It employs a "hawking" strategy, where it perches on a high, exposed branch and darts out to snatch prey mid-air, often returning to the same perch. A fascinating aspect of its foraging is its preference for feeding in the upper canopy of coniferous forests, where it specializes in capturing insects that are active near the tips of branches. During the winter migration to Mexico and Central America, it supplements its diet with small berries and fruits, but insects remain the dominant food source year-round. Interestingly, this species is known to be highly selective, often ignoring abundant but less nutritious insects in favor of larger, more energy-rich prey like crane flies.

Colors

The Hammond's Flycatcher is a small, olive-gray bird with a slightly darker head, two pale wing bars, and a whitish throat and belly. Its most distinctive feature is a narrow, white eye-ring that is often broken or teardrop-shaped, contrasting with its dusky lores. It lacks the bold coloration of some relatives, relying on subtle, muted tones that provide excellent camouflage among the dappled light of coniferous forests.

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