Some time after the Mousekewitz's have settled in America, they find that they are still having problems with the threat of cats. That makes them eager to try another home out in the west, where they are promised that mice and cats live in peace. Unfortunately, the one making this claim is an oily con artist named Cat R. Waul who is intent on his own sinister plan. Unaware of this, the Mousekewitz's begin their journey west, while their true cat friend, Tiger, follows intent on following his girlfriend gone in the same direction.

描述小老鼠一家因为新家情况并不如理想，移民到美国西部的故事

美国鼠谭4：寻兽记

这是一个关于老鼠家庭移民的故事。老鼠Fievel，在从苏联移民到美国的途中跟家人失散，于是它开始漫长的孤独旅程，为了寻找家人而四处闯荡，在纽约遭遇层出不穷的趣事和挑战。经过种种磨难，结果成为当地英雄，并因此得以和家人团聚。

这是一个关于老鼠家庭移民的故事。老鼠Fievel，在从苏联移民到美国的途中跟家人失散，于是它开始漫长的孤独旅程，为了寻找家人而四处闯荡，在纽约遭遇层出不穷的趣事和挑战。经过种种磨难，结果成为当地英雄，并因此得以和家人团聚。