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This concentration of birds during migration can put species at risk. Some spectacular migrants have already gone extinct, the most notable being the passenger pigeon . During migration the flocks were a mile (1.6 km) wide and 300 miles (500 km) long, taking several days to pass and containing up to a billion birds.
Other fruit bat species include the greater and lesser short-nosed fruit bat, Blanford's fruit bat and the cave nectar bat. Fruit bats are sometimes considered pests by fruit farmers, and are hunted and eaten in parts of Guangdong, Guangxi and Hainan. [237] They also help pollinate certain species of tropical fruit trees. [238]
More than 330 species of birds were recorded in the Bahrain archipelago, 26 species of which breed in the country. Millions of migratory birds pass through the Persian Gulf region in the winter and autumn months. [5] One globally endangered species, Chlamydotis undulata, is a regular migrant in the autumn. [5]
It is greatest before migration at the end of the breeding season. The female is generally slightly heavier than the male. [9] It is streaked brown with a white eyestripe, and, in the male, a white chin. As befits its migratory nature, it has long wings, unlike the typically short-winged gamebirds.
When hunting, it often starts flying in early dusk, earlier than most European bats. It flies high above the forested areas that are its preferred habitat, reaching speeds of up to 50 km/h (31 mph). [21] Common noctule bats mainly eat beetles, moths and winged ants. It is known for its high-flying foraging technique, often hunting at altitudes ...
It is protected in the US by the Migratory Bird Treaty Act of 1918, [86] and in Canada by the Migratory Birds Convention Act. [87] In some parts of the US, the range of this swallow has extended south, likely due to changes in land use, the reintroduction of beavers, and nest boxes installed for bluebirds. The tree swallow is negatively ...
The autumn migration season begins in August and ends mid-December, and different types of hawk choose different times in each season to migrate. Some migration distances are longer than others, and birds traveling longer distances tend to depart in early autumn while those traveling shorter distances start much later.
Like all bats in the United States, [54] big brown bats can be affected by rabies. The incubation period for rabies in this species can exceed four weeks, [55] though the mean incubation period is 24 days. [54] Rabid big brown bats will bite each other, which is the primary method of transmission from individual to individual.