标签：migratory 相关文章
You may have spotted V-shaped squadrons of geese heading south this fall. But for many migrantslike smaller songbirdsnighttime is the right time, when it comes to migration. Winds are gentler. And darkness helps them avoid airborne attacks. Of course
2016年Scientific American(十二)月
By Brian Padden Alaska 30 June 2006 Watch Avian Report They face no passport controls or border police. They come unchecked by the thousands, and because they do, authorities in the United States fear they could be a potentially lethal threat. They
2006年VOA标准英语（六月）
[Songbird and traffic noise] It's hard to be a bird in our human-dominated world. You can barely hear yourself sing, let along hear the songs of your friends and you can forget about hearing a predator. Noise is almost everywhere. Especially noise fr
2016年Scientific American(九)月
By Lisa Schlein Geneva 20 April 2006 The International Federation of Red Cross and Red Crescent Societies is launching an appeal for $13.4 million for operations aimed at preventing the spread of bird
2006年VOA标准英语（四月）
By Peter Fedynsky Washington, DC 03 March 2006 watch Combating Bird Flu Migratory birds Last year, avian flu was confined to four countries in Asia. Today, the virus is reported in 33 nations on three
2006年VOA标准英语（三月）
By Sabina Castelfranco Tripoli 23 November 2006 Ministers of the African Union and European Union Thursday ended a conference on migration and development in the Libyan capital Tripoli with a declaration blaming poverty for migration. Sabina Castelf
2006年VOA标准英语（十一月)
By Lisa Schlein Geneva 21 May 2006 World Health Assembly Efforts to strengthen preparedness and response to a possible avian flu pandemic are expected to figure high on the agenda of the 59th World He
2006年VOA标准英语（五月）
By Kurt Achin Seoul 12 September 2007 The World Health Organization says the threat of avian flu is as serious as ever. Members of the WHO's western Pacific region are in South Korea to discuss ways to combat bird flu. VOA's Kurt Achin is at the meet
2007年VOA标准英语（九月）
By Martin Secrest Washington, D.C. 17 January 2007 watch Bird Flu report Bird flu has killed again in Indonesia and is picking up speed elsewhere in Asia, with fresh outbreaks in Vietnam and a new human case reported in China [Wed., Jan. 10]. The cas
2007年VOA标准英语（一月）