This class requires advanced registration to ensure appropriate planning for the field experience. Participants must register by 5pm on the day prior to the outing.
Experience the sights and sounds during the time when day shifts to dusk in the cattail marsh, pond, and sedge meadow habitats of Rock Bottom Ranch. As red-winged blackbirds and song sparrows wind down their activities and wild turkeys fly up to safe roosts in the nearby cottonwoods, the snipes begin their winnowing display flights and Virginia rails start calling. We will experience this fascinating and brief window of time with the goal of learning about birds that are active at dusk and dawn. As daylight fades, our dominant sensory awareness will shift from visual to auditory and we will become immersed in a different and fascinating world.
Please bring warm layers to put on as temperatures drop with the setting sun. Warm jacket, hat, and light gloves are recommended. Wear hiking boots or other sturdy footwear for walking on uneven ground off trails. Please bring a headlamp as it will become dark when we walk back to the parking lot at the conclusion of the outing. Bring your binoculars (or borrow a pair from ACES) and your bird guidebook (optional).
About the Instructor:
Rebecca Weiss is a birding guide and naturalist with thirty years of experience in the Aspen area and Colorado’s mountain regions. She is author of the local guidebook, Birds of Aspen and the Roaring Fork Valley and the primary guide for ACES’ Birding Program. She is a certified interpretive guide and holds a BS in Biology and a MA in Education. Rebecca’s professional background includes bird banding, field research, and conservation writing as well as outdoor education, program administration, and guide training. Past employers and affiliations include the National Park Service, US Fish & Wildlife Service, Outward Bound, and the Rocky Mountain Biological Lab.
06/25/2026
Minimum: 1
Maximum: 10
Registration starts on 06/01/2026 and ends on 06/25/2026.
Please contact Aspen Center for Environmental Studies if you have any questions.