Photo: Tom Johnson

Vaux's Swift

Chaetura vauxi

A small, dark aerialist of the west, often overlooked as it flight high over northwestern forests or low over lakes and rivers with stiff, rapid wingbeats. Similar to the well-known Chimney Swift of the east, but only occasionally nests in chimneys. Because of its reliance on large hollow trees for nest sites, it has become scarce as old-growth forest in the northwest has been destroyed.
Conservation status Populations are known to be declining in Oregon and Washington, probably elsewhere. Major threat is loss of nesting sites from cutting of large and mature trees.
Family Swifts
Habitat Open sky over forest, lakes, and rivers. Often feeds low over water, especially in morning and evening or during unsettled weather. Nests in coniferous and mixed forest, mainly old-growth forest, including redwood, Douglas-fir, grand fir. Resident subspecies in the American tropics occur in other habitats; in the Yucatan Peninsula, may nest in wells around Mayan ruins.
A small, dark aerialist of the west, often overlooked as it flight high over northwestern forests or low over lakes and rivers with stiff, rapid wingbeats. Similar to the well-known Chimney Swift of the east, but only occasionally nests in chimneys. Because of its reliance on large hollow trees for nest sites, it has become scarce as old-growth forest in the northwest has been destroyed.
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Feeding Behavior

Forages in rapid flight, pursuing flying insects and capturing them in wide bill. May forage singly or in flocks. Spiders and sedentary insects in diet may have been captured after being carried high by air currents, or taken from trees by the swifts while hovering briefly in flight.


Eggs

6, sometimes 3-7. White. Incubation is by both sexes, 18-19 days. Young: Both parents care for and feed young. At some nests, one or two additional adults may help parents incubate eggs and feed nestlings. Feeding visits to nest are frequent: average once every 12-18 minutes, perhaps less often as young get older. Young capable of flight at 28-32 days, may return to roost at nest site for several nights after fledging. One brood per year.


Young

Both parents care for and feed young. At some nests, one or two additional adults may help parents incubate eggs and feed nestlings. Feeding visits to nest are frequent: average once every 12-18 minutes, perhaps less often as young get older. Young capable of flight at 28-32 days, may return to roost at nest site for several nights after fledging. One brood per year.

Diet

Mostly flying insects. Feeds on a wide variety of flying insects, including flies, winged ants, bees, moths, beetles, mayflies, and others. Also some spiders and flightless insects.


Nesting

May nest as solitary pairs or in colonies. Courtship involves much aerial chasing, sometimes gliding with wings up in sharp V. Nest site is usually inside hollow tree, reached via broken-off top or woodpecker hole. Sometimes nests in chimneys. Both sexes gather nest material by breaking off small twigs from trees while flying. Twigs are carried in mouth to nest site, cemented into place with sticky saliva. Nest is a shallow half cup glued to inside wall of tree.

Illustration © David Allen Sibley.
Learn more about these drawings.

Text © Kenn Kaufman, adapted from
Lives of North American Birds

Migration

Migrates by day. North American breeders move south in fall, probably most to Mexico. Small numbers may winter along California coast, others may move southeast to Gulf of Mexico. Populations in tropical America may be permanent residents.

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Migration

Migrates by day. North American breeders move south in fall, probably most to Mexico. Small numbers may winter along California coast, others may move southeast to Gulf of Mexico. Populations in tropical America may be permanent residents.

  • All Seasons - Common
  • All Seasons - Uncommon
  • Breeding - Common
  • Breeding - Uncommon
  • Winter - Common
  • Winter - Uncommon
  • Migration - Common
  • Migration - Uncommon
Songs and Calls
A bat-like chipping. Usually silent on migration.
Audio © Lang Elliott, Bob McGuire, Kevin Colver, Martyn Stewart and others.
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How climate change could affect this bird's range

In the broadest and most detailed study of its kind, Audubon scientists have used hundreds of thousands of citizen-science observations and sophisticated climate models to predict how birds in the U.S. and Canada will react to climate change.

Learn more

Read more: climate.audubon.org
Swifts Swallow-like Birds

Vaux's Swift

The darker the color, the more favorable the climate conditions are for survival. The outlined areas represent approximate current range for each season.

More on reading these maps.

Each map is a visual guide to where a particular bird species may find the climate conditions it needs to survive in the future. We call this the bird’s “climatic range.”

The colors indicate the season in which the bird may find suitable conditions— blue for winter, yellow for summer (breeding), and green for where they overlap (indicating their presence year-round).

The darker the shaded area, the more likely it is the bird species will find suitable climate conditions to survive there.

The outline of the approximate current range for each season remains fixed in each frame, allowing you to compare how the range will expand, contract, or shift in the future.

The first frame of the animation shows where the bird can find a suitable climate today (based on data from 2000). The next three frames predict where this bird’s suitable climate may shift in the future—one frame each for 2020, 2050, and 2080.

You can play or pause the animation with the orange button in the lower left, or select an individual frame to study by clicking on its year.

The darker the color, the more favorable the climate conditions are for survival. The outlined areas represent approximate current range for each season. More on reading these maps.
Winter
Summer

Winter Range
Summer Range
Both Seasons
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