We spent many hours during the last spring migration at the crest of Washington D.C.’s Rock Creek Park, hanging out with some of the area’s most experienced birders waiting to see what species would appear next.
When the mornings were slow, the conversation sometimes turned to how unpredictable the migration has become: Some days would be as quiet as July, and others suddenly filled with a flurry of unexpected migrants flying through.
Species in today’s study include many warblers, songbirds and wading birds, such as this Whimbrel. Photo from Cornell Lab by Kyle Horton. Cover photo of Long-billed Curlew is by Nick Saunders.
For years, birders around the country have watched the evidence gather that the bird world has been disrupted.
But this fall, three scientific reports in succession, including a major study released today, have fundamentally altered the picture of what’s happening. Modern technologies are enabling a new level of research about birds, migration, breeding and populations with a precision not possible just a few years ago.
Today’s study is the first to document how birds are starting their spring migration journeys a great deal earlier to keep up with climate change. And while migratory birds are trying to adjust, the research based on 24 years of weather radar data suggests that the intricate balance of when plants flower, insects arrive and birds start breeding are falling out of sync for some of these species.
“How bird populations respond in an era of such rapid and extreme changes in climate has been a black box,” said Andrew Farnsworth, a co-author of the migration study and researcher at the Cornell Lab of Ornithology. “Capturing scales and magnitudes of migration change over time has been impossible until recently.”
Two dozen Great Egrets stood clustered in a shallow pond as if in a ballet rehearsal. They moved along in groups of threes and fours in precise formation. With their long thin necks lining up one minute and crisscrossing the next, they seemed choreographed for elegance.
In late summer, as the hummingbirds are preparing to migrate halfway across the hemisphere, they are in the midst of a feeding frenzy to bulk up for the journey. They consume their entire weight in nectar each day, which the Audubon Society calculated was the equivalent of a human drinking 18 gallons of milk.
arting at dawn they’ll form teams and scour nearby “Important Bird Areas,” counting species to help evaluate how this year’s migrating birds have fared on the flight across thousands of miles to their breeding grounds. Here are some of what they’re likely to see in a gallery of photos Anders has taken from our recent migration trip (run your cursor over the pictures for their species).
