Nature World News: About one in eight bird species around the world is facing extinction, according a new report by Birdlife International. Conservationists say that an investment of US$80 billion per year is required to protect threatened species. The report titled "State of the world's birds: indicators for our changing world" was released at a meeting in Ottawa, Canada. Birds face several threats ranging from habitat loss to climate change. Common birds such as barn swallow and purple martin are disappearing at...