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Weather conditions influence bird flight behavior in ways that make them more or less susceptible to collisions. [22] Conditions which reduce visibility, such as fog, rain, or snow, can disorient birds, especially those that migrate at night and rely on visual cues.
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.
In March 1904, 1.5 million migrating birds died in Minnesota and Iowa during a strong snowstorm. [5] According to The Guardian, this was the largest avian mortality event on record in the region. [5] Records of MMEs have been kept since the 1880s. [5] MMEs of this size are rare, however, and few before or since have been as big as the 1904 event.
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An Alaskan polar bear has become the first of its species to reportedly die from avian influenza, also known as HBN1, after the disease was first detected in the US in January of 2022.. It’s ...
31 December 2010, in Beebe, Arkansas. 3,000 red-winged blackbirds and European starlings died. Arkansas state wildlife authorities first received reports on 31 December 2010, shortly before midnight. Further investigation revealed the birds fell over a one-mile area of Beebe, with no other dead birds found outside that concentrated zone.
Since then, the USDA reports that over 70 million birds in the U.S. have been impacted, with 11.4 million being affected last month alone. The virus has also spread to birds in over 80 countries.
The largest numbers of strikes happen during the spring and fall migrations. Bird strikes above 500 feet (150 m) altitude are about 7 times more common at night than during the day during the bird migration season. [24] Large land animals, such as deer, can also be a problem to aircraft during takeoff and landing.