After the birds had been brought inside and taken out of the bags, the first thing to be done was to tie a band about one of their legs, as if to give them an ID card, and only then to start measuring and recording --the purpose being to avoid the kind of mix-up where bird A's beak length gets recorded as bird B's leg length or the like.
將鳥兒帶回室內，由鳥袋取出的第一件事是先繫上腳環，如同先發給它一張身分證，再開始進行測量和記錄，目的是避免錯誤，否則大家七嘴八「手」，有人粗心大意把這隻鳥的嘴長記成那隻鳥的腳長就糟了。