"A small but dangerous parasite, the winter tick, is spreading north and west as winters become shorter and now is knocking at Alaska's border. The winter tick, which has already devastated moose populations in New England and the upper Midwest, has been confirmed in Canada's Yukon Territory and in the Northwest Territories, where it's infecting elk, mule deer and some moose."

"The Supreme Court on Monday refused to hear a challenge to the U.S. Fish and Wildlife Service’s decision to designate 187,000 square miles of Alaska’s coast and waters a critical habitat for the threatened polar bear."

"A robot zaps and vacuums up venomous lionfish in Bermuda. A helicopter pelts Guam's trees with poison-baited dead mice to fight the voracious brown tree snake. A special boat with giant winglike nets stuns and catches Asian carp in the U.S. Midwest."

"Bison calves have been born in Alberta's Banff National Park for the first time in 140 years, Parks Canada officials said on Tuesday, marking a milestone in attempts to reintroduce a wild herd to the area."

"The Interior Department no longer supports legislation that would transfer the National Bison Range to the tribes whose reservation it's located within."

"Eric Newman speeds through the maze of bayous at the Mississippi River's mouth with the confidence of someone who's done this for decades. He points to prime spots to catch redfish, where crabbers go for blues and the grassy channel where his grandfather had a fishing camp. Suddenly, he slows his boat."

"Wildlife conservation groups sued the U.S. government on Wednesday seeking to halt a plan to trap and kill as many as 120 mountain lions and black bears in Colorado in a bid to stem declines in populations of mule deer favored by hunters."

"A top federal appeals court has added fuel to a long-running fight over federal protections for the northern spotted owl in California, Oregon and Washington state."

"About a month after an anti-predator device spit sodium cyanide in the face of an unsuspecting boy and killed his dog, the U.S. Department of Agriculture has announced it is ending its use of the M-44 mechanisms in Idaho indefinitely."