Richard and Diane Van Vleck Personal Pages
The Home Habitat
Observations of prey brought to purple martin nestlings
This past summer (2017), I spent a good deal of time monitoring the insect prey brought to their gourds by purple martins. Previously, I had photographed and recorded video at barn swallow nests, but found that their prey items could not be identified in the majority of feeding visits. In contrast, the martins were more than obliging in landing on a perch above the gourds and showing me what insects were hanging out of their beaks. Or, more accurately, they were not afraid of me standing on a scaffold near them because they know I could not fly and seldom jumped. But, they were reluctant to fly to their gourd, thus revealing the location of their nest. I limited my observations to 5 minute sessions so as not to delay their feeding too long. During these sessions, the martins usually waited me out, and then delivered their prey as soon as I climbed down to the ground. But, occasionally one martin would eventually go to the gourd anyway. On the back side of the rack, the gourd entrances were hidden from my view and feeding went on as usual.
From the frequency of feeding at each gourd and the estimated volume of prey being brought, it appeared that there was no shortage of nearby insect prey. As for my previous year’s concern that the large number of dragonflies brought to the martin nests would put that species at risk, there were more dragon flies this year than last, including after the martins had all fledged. Butterflies were also taken, but, mostly various skippers and cabbage whites, species that are still extremely common here. Of course, most small insects were hidden in the bird's mouth. On one day, great mouthfulls of hover flies were being brought to the gourds. Tree swallows were also doing the same. Hoverflies must swarm in large numbers. The martins can continue scooping up insects while retaining large numbers in their mouth. They also frequently return to the nest with a mix of small and not so small species. They are truly aerial vacuum cleaners.
2017 Tree Swallow Prey Photos
|barn owl||American kestrel||purple martin||barn swallow||Eastern bluebird|
|tufted titmouse||Eastern phoebe||yellow shafted flicker||tree swallow||chimney swift|
|house wren||big brown bat||Carolina wren||brown thrasher||catbird|
|cedar waxwing||Northern mockingbird|
|Yellow warbler||Acadian flycatcher|
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