Scientists alarmed by the demographic explosion of exotic birds in the UK

May 14, 2011STANWELL, England — The evening started peacefully enough at Long Lane Park Rekreeyshna in the western suburbs of London. But just before sunset, five bright green missiles streaked through the air to a number of poplars at the edge of the park.
Within minutes, hundreds more screaming birds — in the formation of 10, 20, 30 strong — have passed above the neat houses and club cricket, whistling to their night roost.

A native of the Indian subcontinent and sub-Saharan Africa, ozherelovy parrot enjoying a population explosion in many London suburbs, turning the once-exotic bird into a notorious pest that awakens children, monopolizes garden bird feeders and might even threaten British crops.
A rough estimate put the population at 30,000 in the UK several years ago, from just 1,500 in 1995.
Researchers at Imperial College, London now trying a more scientific census through its Project parakeet who recruited volunteer birders across the country to simultaneous account on the last Sunday evening.

There is broad agreement that the Adams and Eves behind the current population boom did not fly here from Asia or Africa, but escaped from Britain's favorite cell or was intentionally released by their owners.

Big mystery — what allowed parakeets have children with such phenomenal success only in the past decade.
Theories abound.
It happens so that gardeners instill more exotic ornamental plants, effectively providing imported food to match an imported bird species?
The fact that the suburban set more consumers and produce more semen? Fast growing British working in the garden industry guards sales and provided little guidance.
Alternatively, some scientists suggest that a slightly warmer climate has really helped to tip the scales, possibly increasing metabolism parakeet during its breeding season in February, supporting the growth of its preferred food or killing predators.
Perhaps the answer lies in the numbers game that prevails in any dating venue:
as soon as the population passed a certain threshold, it is more likely that each parakeet could find a mate and shelter on the outskirts.
The new bird census may help shed some light on the trend.
Scientists, birders and policymakers are "waiting with bated breath these last numbers," said David Leach, a senior research ecologist at the British Trust for Ornithology.
— News of the desert

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