As fall migration ramps up, swallows and other passerines are gathering into flocks and beginning to move south. Late nesting cedar waxwings are fledging their broods, and gray, streaky juveniles are joining adults in flocks.
Here in the Aspen area, these foraging flocks are exciting to find! We can enjoy extra practice with identification skills as we learn to discern adults and hatch-year birds in these flocks. Other birds, such as flycatchers, thrashers, and sparrows are dispersing following the nesting season. No longer tied to their breeding habitats, these birds are on the move, taking advantage of seasonally-available foods wherever they occur – and keeping us on our toes as they show up in unexpected places!
Join us for this early fall walk through Difficult Campground to observe these autumnal avian phenomena. Following out late April Spring Primer at Difficult, this field trip bookends the latter end of breeding season and a turning point in fall migration as birds begin to pour southward.
This outing meets at the entrance to Difficult Campground/trailhead.
09/10/2026
Minimum: 1
Maximum: 10
Registration starts on 09/01/2026 and ends on 09/10/2026.
Please contact Aspen Center for Environmental Studies if you have any questions.