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WTSWWhite-Throated Swift (bird species Aeronautes saxatalis)
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The White-throated Swift (Aeronautes saxatalis) is a widespread and familiar element of the southern California avifauna.
All of the White-throated Swift nests observed at this location were shallow saucers of plant material and feathers glued together with saliva (Figure 1 a).
The eggs of the White-throated swift, like those of other swift species (Chantler 2000), were uniformly creamy white without gloss although they sometimes became spotted by excrement of ectoparasitic cimicids (Figure la).
At hatching, White-throated Swift chicks were pink-skinned, devoid of any natal down, with eyes closed and a prominent egg-tooth.
White-throated Swift chicks increased in body weight from about 2 grams at hatching to as much as 46 grams prior to fledging.
The locals: Chattering white-throated swifts zip between rocky cliffs; on the desert floor the midget faded rattlesnake has a pattern that looks like faded drops of blood.
Abundance of white-throated swifts (Aeronautes saxatalis) and swallows (Hirundinidae, especially violet green swallows Thalassina tachycineta) also were related negatively to turbidity, as documented below.
Prey were categorized into 11 relatively discrete groups (guilds) on the basis of body size and our observations of their behavior (Tables 1 and 2): 1) large wasps; 2) waterfowl (Anseriformes, Podicipediformes, and similar birds); 3) small raptors and scavengers (e.g., American kestrels Falco sparoarius and common ravens Cocoas corax); 4) shorebirds (Charadriiformes, except large Laridae); 5) waders and other large, non-anseriform waterbirds (e.g., Ciconiiformes and large Laridae); 6) belted kingfishers (Ceryle alcyon); 7) aerially feeding white-throated swifts and Hirundinidae, especially violet-green swallows; 8) non-riverine terrestrial birds (e.g., Columbiformes and terrestrial Passeriformes); 9) unidentified birds; 10) bats; and 11) other terrestrial taxa (mammals and reptiles).
Foraging attempts on white-throated swifts and violet-green swallows often were observed, comprising 29% (104 cases) of total attempts.
Proving his point, he raises his binoculars and gestures to a pair of white-throated swifts flying near the top of the 8,717-foot granite North Dome.
On a quiet summer morning in Big Bend National Park, visitors marvel at white-throated swifts fluttering along a canyon wall as a peregrine falcon suddenly dives with breathtaking speed to catch a swift on the wing.
For example, how common are Broad-billed Hummingbirds and White-throated Swifts in the region, as opposed to Black-chinned Hummingbirds and Chimney Swifts?