Puffy fair weather cumulus clouds dot the western sky as a glow of morning light spreads across the golden green meadow. The air feels cool and humid on the shady trail, but it is tinged with pronounced mugginess in the patches of sunlight - a sign that it will be another hot July day here in the Sierra Nevada. Hodgdon Meadow snakes along Old Big Oak Flat Road at around 5,000 feet above sea level, just inside the western boundary of Yosemite National Park. Ringed by stately evergreens and filled with waist high sedges and dense willow thickets, it is a haven for wildlife. Of particular interest this morning are the small winged aviators now gliding swiftly overhead and across the meadow in search of food and shelter. They fill the air with a cacophony of sounds - an undercurrent of warbles and chirps, overlaid by the melodious trill of a Pacific wren, and occasional punctuations of the Olive-sided flycatcher, “Quick, three beers!”. I’ve been invited by Sarah, a park biologist, to join her curious, energetic daughter, and a local volunteer from the neighboring community of Groveland for a site visit to a park project funded by a grant from Yosemite Conservancy. We are heading out to one of seven banding station where we will observe field technicians as they catch songbirds.
This delicate, diverse avian family has been known throughout history for its complex, inspiring vocalizations. In recent decades, however, songbirds have also gained recognition for their sensitivity to habitat loss. Significant declines in a variety of species have been documented, prompting scientists to take action. The Institute for Bird Populations (IBP) was established in 1989 to coordinate 500 banding stations to research and share information regarding the population and distribution of birds across the continent. This crucial long-term dataset looks not only at individual variables, but also the cause and effect relationship between them, making it a very power tool for scientific research.
When we arrive at the station, no one is around. A small black table is blanketed with papers, tools and writing utensils. Clothes-pinned to the length of one side of the table are small dangling cloth sacks. Some of the bags twitch sporadically, belying the contents inside. As the technicians make their rounds every forty minutes between seven different nets, they collect the birds that have become ensnared. A half dozen or more may be gathered during this time, so the cloth bags allow the birds to be safely transported and kept in waiting, until their turn to be examined. This state of suspension doesn’t seem to cause the birds too much alarm. Even after they are extracted from the bag, most are fairly calm as long as their wings are kept pinned to their sides. One exception are the Northern flickers, who vocalize a continuous stream of car alarm-like shouts while being handled.
Measure wing length, puff of air to the chest to check for body fat or a brood patch, puff of air to the skull to determine age based on the pattern of bumps that emerge as the cranium matures, spread the wings to look at feather condition, tip the bird upside down into a cylinder to keep it still while being weighed, all the while scribbling numbers and codes onto a data sheet. For all but the hummingbirds, look for a numbered band and if none is found, secure one to encircle the leg like a bracelet. After weeks in the field, this team works like a well-oiled machine. Questions and uncertainties are discussed and negotiated with the help of various manuals passed back and forth across the table. The slightest suggestion of curiosity by visitors is met with an assured, demonstrative response. It was explained to me by one of the technicians that each primary feather is assigned a number. Because juveniles and females are so similar in appearance, sometimes the only way to determine the exact species is by noting the difference in length between two particular feathers. I marvel at their capacity for attention to such nuances. Sarah is clearly proud of the work they’ve been doing, and already wistful about losing her team lead, who was recently offered a position by the IBP to be a regional coordinator for independent field research teams.
The birds are examined with deft efficiency, and then carefully set free. After being restrained, some seem to forget that they know how to fly, and so they hold still for a moment suspended in time. At this point in the process, visitors are encouraged to participate. I am offered the opportunity to release an Anna’s Hummingbird, and suddenly a breath of feathers is slipped into my hand. I’m hardly aware of its physical presence, except for the warmth that concentrates and spreads across my open palm underneath its fragile body. I am coached to gently rock it back and forth onto its stomach, and with a few shallow bobs of my palm the sprightly bird elevates up into the air. The flash of movement and sudden pulse of wing beats against my hand cause me to gasp. I remember in that moment that it is possible to hear your soul shout for joy. I glance at my instructor and I see it in her eyes too – the childlike wonder of the moment when this wisp of bone, muscle and feathers manifests into pure grace. How privileged we are to be surrounded by such every day miracles.
