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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.
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.
Bird flu has been causing bird deaths for decades, with strains of the virus identified since 1996 and notable outbreaks in 2004 and 2005. However, the present outbreak marks the most severe case ...
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A different version of bird flu — H5N1 — has been infecting poultry flocks over the last several years, leading to millions of birds being culled. It also has been spreading among all ...
The Beebe, Arkansas bird deaths were repeated again on New Year's Eve of the following year, 2011, with the reported number of dead birds being 5,000. [ 14 ] On 3 January 2011, more than five hundred starlings, red-winged blackbirds, and sparrows fell dead in Pointe Coupee Parish, Louisiana .
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