Two families that share the sky over the Salt Lake Valley and almost nothing else. Sort them by shape and motion first — plumage is the last step, not the first.
Before you even focus the binoculars.
Tap through to a name.
The full key — follow the arrows to a name.
For swallows, it does most of the work.
Ordered common → rare. Amber box = the clinching mark.
Hirundo rustica
Fast, low, coursing over fields and water. Cup nests on ledges and under eaves, Apr–Sep. The most-reported aerial insectivore in the county.
Petrochelidon pyrrhonota
Colonial — gourd-shaped mud nests by the dozen under bridges, overpasses, and canyon culverts, Apr–Aug.
Tachycineta thalassina
The default swallow over Wasatch neighborhoods and canyons, Mar–Sep. Compact, fast, high.
Stelgidopteryx serripennis
Widespread over rivers, ponds, and culverts near water — reported more often than its plain looks suggest.
Tachycineta bicolor
Tied to water and nest boxes; one of the earliest spring arrivals. Less widely reported than the swallows above.
Riparia riparia
Colonial burrow-nester in dirt and sand banks — abundant at a colony, patchy everywhere else.
Progne subis
Utah's population is a western, mountain-forest type tied to aspen snags — not the eastern martin-house scene. Genuinely scarce down in the valley.
Aeronautes saxatalis
The odds here lie. It's reliable, often abundant, at Wasatch canyon mouths, quarries, and downtown cliffs Apr–Sep — but almost all county checklists are logged in the lowlands, so its countywide frequency badly understates how findable it is in the right habitat.
Cypseloides niger
Nests behind and near waterfalls at a handful of Utah sites. Low odds in the county — mostly a canyon-trip bird.
Chaetura vauxi
A scarce passage migrant, not a valley breeder. Roosts communally in chimneys — watch dusk swirls in spring and fall.
Where careful birders still trip.
Violet-green vs Tree Swallow
Both green-blue above, clean white below. Face: Violet-green's white wraps up above & behind the eye; Tree's dark cap ends at the eye. Rear: Violet-green's white flanks nearly meet over the rump (white “saddlebags”); Tree has a plain dark rump. Violet-green is also the more frequently reported of the two.
Bank vs N. Rough-winged
Both plain brown above. Bank has a crisp, complete brown band across white; Rough-winged has a dingy, smudged throat that fades into white — no clean line. Rough-winged is broader-winged, more languid, and turns up on more checklists.
Juvenile Tree vs Bank Swallow
Young Tree Swallows are brown above and can show a faint gray chest smudge mimicking Bank's band. Tell: the smudge is diffuse and incomplete, and the bird is bulkier with a cleaner white face.
White-throated Swift vs a distant swallow
A fast dark-and-white bird by a cliff is usually the swift. Confirm on wingbeat and wing shape: stiff flicker + thin swept scythe = swift; relaxed banking + triangular wings = swallow. The swift's white flank patches flash as it rolls.