More than 1/4 of U.S. birds threatened: report

By Deborah Zabarenko, Environment Correspondent

WASHINGTON (Reuters) - More than a quarter of all U.S. bird species are vulnerable to extinction, according to a comprehensive list compiled by two conservation groups released on Wednesday. Global warming may be partially to blame.

The new WatchList 2007, compiled by the National Audubon Society and the American Bird Conservancy, found 178 species in the continental United States and 39 in Hawaii in danger.

Of those, 98 are on the "red list" of greatest concern, and 119 in the "yellow" category, indicating their numbers are seriously declining or the species is rare.

Global warming, the loss of habitat due to urban and suburban sprawl and the current U.S. administration's policies on endangered species are all to blame, a co-author of the list said in a telephone interview.

"It's a sign that basically the human relationship with the environment is off-kilter and these are some of the species that are suffering from that," said Gregory Butcher of the National Audubon Society.

The sea level rise caused by global warming puts pressure on bird populations, Butcher said.

Coastal bird habitats of species like the seaside sparrow and the piping plover are likely to be inundated, he said.

"And because there's so many people living close to the oceans, we're not sure that the natural habitats at the edge of the sea will continue to exist in the face of sea level rise," Butcher said.