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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.
Even though migratory bird acts were passed in the early 20th century, many countries still have no laws or programs to protect migratory birds. International bird trade is a multibillion-dollar industry and hundreds of exotic birds are captured and then sold all over the world. Malta, an archipelago of small islands along the Mediterranean, is ...
The passing of the Migratory Bird Treaty Act of 1918 in the United States resulted in a need for more information on bird migration. Frederick Charles Lincoln was put in charge and improved methods for trapping and banding, developed record-keeping procedures, recruited banders, fostered international cooperation, and promoted banding as a tool for research and wildlife management.
Pages in category "Bird migration" The following 32 pages are in this category, out of 32 total. This list may not reflect recent changes. A. Altitudinal migration;
Bird migration is controlled primarily by day length, signalled by hormonal changes in the bird's body. [20] On migration, birds navigate using multiple senses. Many birds use a sun compass, requiring them to compensate for the sun's changing position with time of day. [21] Navigation involves the ability to detect magnetic fields.
This height was recorded over Nevada; [1] [4] [5] This record occurred when a Lockheed L-188 Electra turboprop airliner operating a Western Airlines flight suffered a bird strike at cruising altitude. [8] Bar-tailed godwit: Limosa lapponica: Scolopacidae: 6,000 metres (20,000 feet) [5] [9] It can reach this height while migrating. White stork ...
The Pacific Flyway is a major north-south flyway for migratory birds in the Americas, extending from Alaska to Patagonia. [1] Every year, migratory birds travel some or all of this distance both in spring and in fall, following food sources, heading to breeding grounds, or travelling to overwintering sites. [2]
Altitudinal migration is a form of short-distance migration in which birds spend the breeding season at higher altitudes and move to lower ones during suboptimal conditions. It is most often triggered by temperature changes and usually occurs when the normal territories also become inhospitable due to lack of food. [ 181 ]