This year eight volunteers are monitoring nest boxes at Draper Twin Lake Park, Charles Ilsley Park and along the Paint Creek Trail in Oakland Township. We keep track of when the nest is built, the date of the first egg laid, the hatching date and if possible, the fledgling date when the little Eastern Bluebirds, Tree Swallows, House Wrens or Chickadees exit the nest and come out into the big world.
We report our data to NestWatch, a citizen scientist project of the Cornell University Ornithology Lab.
Well, the excitement has peaked in the last two weeks as fledglings begin to screw their courage to the sticking point, leap out of their dark, cozy nests and take to the air. Two weeks ago, I was lucky enough to see a tiny Eastern Bluebird (Sialis sialis) launch itself out of the nest box that I’m monitoring near my house and caught the moment with my camera as well. (Use the pause button if you need more time for captions.)
And now many of us volunteers and members of the birding group feel like we’re in a nursery, because we’re surrounded by baby birds! Unlike the young bluebird, Tree Swallow fledglings (Tachycineta bicolor) “are strong fliers as soon as they leave the nest,” according to the Stokes’ Guide to Bird Behavior (Vol.1). This one at Charles Ilsley Park seemed to emerge from its nest fully ready to fly. Perhaps that is necessary since swallows feed on the wing. But the adults will help feed their fledglings for the first two or three days. (Click on photos to enlarge; hover cursor for captions.)[Edit: I’ve deleted the two closeups of the fledgling because from photos others took, I’m not sure it was the fledgling. My apologies.]
In the eastern prairie at Charles Ilsley Park, a Field Sparrow (Spizella pusilla) flitted about among the Foxglove Beardtongue (Penstemon digitalis). Its slim shape and erratic display behavior made me think it might be a juvenile, too. A larger Field Sparrow (probably a male) sat calmly nearby with a grasshopper nymph in its beak. But when I returned the next day, the slim Field Sparrow again flitted distractedly about in the same location and again was accompanied by another Field Sparrow. My former experience with Field Sparrows had been that they often are elusive and dive into the grass at a moment’s notice. But I’ve learned that in the early spring, Field Sparrows nest on the ground if they have enough cover, which this beautiful prairie now provides. I’m wondering if these two were mates who were trying to distract me from a nest hidden among the flower stems. Since there are low bushes nearby, however, the nest could have been along the tree line since these sparrows make nests in low bushes later in the season.
Back at my home, a clutch of Eastern Phoebe fledglings (Sayornis phoebe) appeared in a low bush at dusk. They’d evidently left the nest under the eaves of the nearby shed very recently and a harried adult was busy trying to feed them. Luckily, both Phoebe parents share this exhausting task. One of the fledglings, as you’ll see below, was smaller and a loner. Perhaps that’s not surprising since Cornell says the Phoebe “is a loner, rarely coming in contact with other phoebes.” It may just have been the last to fledge and is still adjusting to the being out of the nest – or perhaps it’s the “runt of the litter.” But its noisier siblings probably had a lot more luck getting fed that night!
Many birds have more than one brood in a summer – so be on the lookout! Your yard may be hosting hard-working parent birds and their rambunctious, noisy, begging youngsters! Our parks certainly are!