The harlequin duck shown here was coast of British Columbia. band describing when and where it was caught was put on its leg. Months later, the bird was sighted resting on a rock near a stream in the Rocky Mountains. A researcher could tell where the duck had been originally caught by the colour and number-letter code on its hand. Why do you think this information is important in helping ecologists understand species of duck and the ecosystem in which it lives?
这是作业…………………………看不懂来的……………………谁可以帮忙翻译一下………………谢谢OTZ
