Vaux’s Swifts forage in flight, eating tiny insects and spiders
that they catch via rapid aerial pursuit. They eat flies,
hoverflies, booklice, ants, bees, leafhoppers, planthoppers,
aphids, spindlebugs, lanternflies, bark beetles, moths, mayflies,
and true bugs. They forage in flocks, pairs, or singly, coursing
back and forth over productive areas. On occasion, these swifts
seem to flutter or stall over the tips of tree branches, perhaps
to glean an insect resting there. When feeding young, Vaux’s
Swifts capture over 100 insects and spiders per sortie, which they
form into a bolus (ball) that they regurgitate to the young at the
nest. They may make over 50 sorties per day.
On 5/31/2021 10:56 AM, Roger Adamson
Just noticed a behavior I had not seen
before. A couple of Vaux’s Swifts were foraging above my
garden and they were repeatedly passing through and pausing
(of course, not perching!) within a two Douglas Firs. The
birds were only about 20 ft off the ground. They did this for
several minutes, then moved on.
HI Roger, Found this on Cornell website. My hummingbirds are doing
this, too! Linda.