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Nocturnal migration can be monitored using weather radar data, [40] allowing ornithologists to estimate the number of birds migrating on a given night, and the direction of the migration. [41] Future research includes the automatic detection and identification of nocturnally calling migrant birds.
"80% of our migratory birds here in North America are actually migrating at night," he said. "A large impact that humans actually have on birds during migration is with the light that we produce ...
Here are spring bird migration statistics for Chatham County, based on BirdCast estimates: Total migrating birds: 40 million Most in flight at one time: 228,000 at 2:10 a.m. on May 2
By comparing more than two decades of radar data showing bird movements at night across the U.S., one study documented the shifting migration patterns. “We’re not just sort of seeing one ...
Mortality on wintering grounds: Unreasonably cold temperatures on the wintering grounds kills thousands of birds, resulting in 30-90% population declines of migratory birds. For example, between 27000 and 62000 ducks, mostly tufted duck and common pochard , starved to death during a very cold winter in March 1986.
Coot species that migrate do so at night. The American coot has been observed rarely in Britain and Ireland, while the Eurasian coot is found across Asia, Australia and parts of Africa. In southern Louisiana, the coot is referred to by the French name "poule d'eau", which translates into English as "water hen".
During the late summer and early fall, hummingbirds will migrate back to warmer weather after arriving in the Midwest earlier this spring. Bird-watchers can expect to see hummingbirds — the tiny ...
The corn crake is solitary on the wintering grounds, where each bird occupies 4.2–4.9 ha (10–12 acres) at one time, although the total area used may be double that, since an individual may move locally due to flooding, plant growth, or grass cutting. Flocks of up to 40 birds may form on migration, sometimes associating with common quails.