David Haskell created artificial nests with clay eggs and placed them on the ground beside a tape recorder that played the begging calls of either tree-nesting or of ground-nesting warblers.
David Haskell 制作了一些盛有泥蛋的人造鸟巢并把它们放在地面上，旁边有一个录音机，播放着树莺或地面莺的的乞食叫声。
2
Members of the group use a tape measure to gauge the size of a tree.
天使长古树档案组织的成员们正在利用卷尺测量树的尺寸。
3
Listen to the tape then answer this question. Is the cat climbing the tree?