North America nature

Articles in ‘North America nature’

Photos of hummingbirds in mid-flight

July 23rd, 2009 Ruby-throated hummingbird Some fantastic and rare photos of US hummingbirds in mid flight fron Environmental Grafitti. Image: John C. Stroud

Alaska walrus survey raises alarm

July 22nd, 2009 A partial survey of Pacific walrus estimates their minimum population at just 15,164. A 1990 aerial survey estimated the population at 201,039 in the same region, but the count is likely to have missed a number of animals Anchorage Daily News See also: Canada, Greenland to do High Arctic walrus survey The movement of walrus is becoming increasingly important as the Arctic sea ice shrinks (CBC)

Why autumn is different in Europe to Asia and America

July 21st, 2009 Trees in Europe tend to produce yellow leaves, while those in America and eastern Asia produce red leaves. Nobody knew why, but scientists have now published a theory that could explain the difference. They think that red-leafed trees in America and Asia only exist because they and their insect pests managed to survive a series of ice ages long ago. BBC

Florida pythons to be trapped

July 20th, 2009 The death of Shaiunna Hare, a 2-year old child from Florida in the coils of an 2.5 metre Burmese python has sparked an official crackdown to eradicate the 100,000 of these predators in the state. The Guardian The pythons are also a severe threat to the unique eco-system of Everglades.

How to save the polar bear

July 20th, 2009 New York Times editorial. “Interior Secretary Ken Salazar has upheld a Bush administration finding that the Endangered Species Act is not a suitable tool for restricting carbon dioxide and other greenhouse gases threatening the polar bear and its habitat. We agree, with this codicil: There are steps Mr. Salazar can and must take under the act — steps that the Bush White House would not — to protect the bear..”

Wolverines back in Colorado

July 20th, 2009 A single wolverine has returned to Colorado for the first time in 90 years. Wolverines used to be common south of Canadian border, but there are now only an estimated 250 to 500 wolverines in the lower 48 states. Wolverines were severely persecuted in the past by trappers who prized their almost waterproof fur, ranchers who killed them with poison bait and developers who divided their range with highways and other infrastructure.  New York Times According to the Colorado Wildlife Divsion “Occasional reports of wolverine sightings were investigated, but wolverines were never officially documented. In spring 2009, researchers with the Greater Yellowstone Wolverine Program tracked a wolverine from Grand Teton National Park south into north central Colorado utilizing satellite-collar technology. The wolverine was the first confirmed in the state in 90 years.”

Oyster reef under threat in California

July 17th, 2009 Oyster reefs in a California coastal estuary have been devastated by invasive Atlantic Coast crabs and snails, providing new evidence, if it were necessary, of the consequences of the danger of invasive species. Half the population of California’s native Olympia oyster has perished since the arrival of these alien species, Science Daily

Humboldt squid attacks

July 17th, 2009 Scuba divers in the waters off San Diego are being attacked by large numbers of beaked Humboldt squid. One diver described how one of the rust-coloured creatures ripped the buoyancy aid and light from her chest, and grabbed her with its tentacles. BBC

Swimming pigs of the Bahamas

July 17th, 2009

Pythons in Florida

July 17th, 2009