Sentences with phrase «numbers of our birds due»

Like the canary in the coal mine, the silencing of large numbers of our birds due to a multiplicity of human - related factors, including cat predation, is a warning to us to act now in support of our bird populations.

Not exact matches

Among the questions that this study raises are whether the surprisingly large number of neurons in bird brains comes at a correspondingly large energetic cost, and whether the small neurons in bird brains are a response to selection for small body size due to flight, or possibly the ancestral way of adding neurons to the brain — from which mammals, not birds, may have diverged.

A Tulane University researcher who studies bird migration has found that a decline in the number of wood thrushes is probably due to deforestation in Central America, not to the loss and degrading of forest in the United States where the songbird breeds.

But he believes the smaller number of nests could be due to the birds failing to secure a long - term mate in the noisy surroundings and that they still happily inhabit these environments, just like the plumbeous vireos.

Problem Hawaii has the highest number of endangered birds in the US due in part to avian malaria, a parasite introduced into Hawaii that is causing disproportionate mortality in native forest birds, particularly honeycreepers.

Biologists also have used the studies from Marra, Temple, and a number of others to estimate the total U.S. death toll for birds due to cat predation as more than a billion per year.

Most of these keep classical pets such as dogs, cats, rabbits, small rodents, birds and fish, but an increasing number of companion animals are exotic and wild animals, posing a poorly understood risk for both human and food animal health, due to the unfamiliarity with the infectious agents they may harbour and poor regulation of the wildlife trade.

We learned that bird populations in the North Sea collapsed last year, after the sand eels on which they feed left its warmer waters - and how the number of scientific papers recording changes in ecosystems due to global warming has escalated from 14 to more than a thousand in five years.