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If the timing of the highest availability of a bird species' main food source happens earlier than its migration timeline because of warmer weather, then it will likely miss the time for resource gathering. [27] In response, changes in bird phenology have been observed over the past 50 years, such as the lengthening of spring migrations ...
Starting in the summer of 2015 and continuing into the spring of 2016, about 62,000 dead or dying birds were found on Pacific Ocean beaches from California to Alaska. Some researchers believe that as many as one million common murres may have died in the massive die-off.
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.
Cats can get bird flu, and half known to be infected died, according to a study from last summer on farm cats fed raw milk from infected cows. Cats have also been infected by eating pet food ...
As government agencies prepare for a potential shutdown, questions about a potentially burgeoning H5N1 bird flu pandemic are top of mind for many public health and agriculture officials.
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.
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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.