论文部分内容阅读
据有关资料表明,一种生活在中美洲和南美洲的大蟾蜍就曾多次为消灭害虫立下大功。这种大蟾蜍身长达25cm,宽12cm,重量达1千克。它的主要食物是一些对热带作物有害的昆虫。19世纪,西印度群岛的热带作物被害虫侵袭,这种大蟾蜍被调动到那里,在那里捕食、繁殖,把当地的害虫消火得干干净净。20世纪30年代,人们曾把150只大蟾蜍用飞机运到夏威夷群岛,用来保护那里的甘蔗田。几年中大蟾蜍很快繁殖起来,并且胜利地完成了任务。以后,这些在夏威夷群岛繁殖的大蟾蜍的后代又被人们运送到菲律宾、新几内亚、澳大利亚等有热带作物生产的地区,大蟾蜍同样表现出
According to relevant information, a large toad living in Central and South America has repeatedly made great efforts to eliminate pests. This big toad is 25cm long, 12cm wide and weighs 1kg. Its main food is some insects that are harmful to tropical crops. In the 19th century, tropical insects in the West Indies were attacked by pests and the large toad was mobilized there for prey, reproduction and firefighting of local pests. In the 1930s, 150 large bucks were transported by airplane to the Hawaiian Islands to protect the sugar cane fields there. Toad quickly multiplied in a few years, and successfully completed the task. From then on, these descendants of the large toads that breed in the Hawaiian Islands were transported to places with tropical crops such as the Philippines, New Guinea, and Australia, and the Bufo bufo also showed