Sentence examples for concentration of birds from inspiring English sources
The concentration of birds in Asia, for example, is behind the spread of avian flu there, he said.
Winter is a season of highest concentration of birds and hunting pressure but woodcock precise habitat requirements are poorly known.
Mr Rogers is particularly concerned about the threat of avian flu posed by massive chicken farms because of their sheer size and concentration of birds.
Mr. Kimball also speaks to scientists, who call the concentration of birds there "the Central Park effect," and who attempt to count every bird in the park each Christmas season to produce the annual report of birds in decline, which now includes nearly a quarter of all species.
Some predators take advantage of the concentration of birds during migration.
Several international treaties have been signed to protect migratory species including the Migratory Bird Treaty Act of 1918 of the US. and the African-Eurasian Migratory Waterbird Agreement The concentration of birds during migration can put species at risk.
"You get this tremendous concentration of bird species in New York City," said Matthew Wills, a Brooklyn resident and frequent Audubon Society volunteer who has been a serious birder since 2001.
For instance, perhaps we should refrain from placing strong AM radio emitters along routes where huge concentrations of birds migrate.
There is a growing trend toward aerial applications of deadly poisons, like parathion, a member of the family of organic-phosphate insecticides, for the purpose of "controlling" concentrations of birds distasteful to farmers.
These dense concentrations of birds are thought to be a defence against attacks by birds of prey such as peregrine falcons or Eurasian sparrowhawks.
