Visitors to the zoo usually pity the animals owing to their particular emotional associations (联想). Which animals should be indeed pitied?
The first type are those clever and （56） developed animals （57） lively intelligence and desire for activity can （58） no outlet behind the bars of the cage. Those animals living in a free state before （59） in the zoo have a strong desire for moving about （60） , but have to mm around repeatedly in their quarters. Owing to this disappointment, foxes and wolves （61） in places which are far too small, are among the most （62） of all zoo animals.
Another sad scene, seldom （63） by ordinary zoo visitors, is the （64） flying trials of swans (天鹅) at migration (迁徙) time. These creatures, like most other water birds, are generally made unable to fly by the （65） of cutting off a tip of the wing bone. （66） such swans in the zoo generally seem happy under （67） care and they raise their young without any trouble, at migration time things become （68） . The birds never really （69） that they can no longer fly, and repeatedly swim to the （70） of the pond so that they can have the whole extent of its surface when trying to （71） against the wind. Meanwhile, their loud flying calls can be heard as they try to （72） , and again and again the grand preparations end in （73） .
I do not like seeing those （74） water birds in the zoo. The missing tip of one wing and the still sadder picture that the bird makes when it （75） its wings hurt me badly. What a truly sorry picture it is!