Sentence 1: Tony loved all animals, and always wanted to bring home wild ones. 
 Sentence 3: His mother was repulsed, and thought it was little better than a rat 
 Sentence 4:  The squirrel recovered, and Tony looked forward to training him 
 Sentence 5:  But he got home to find his mother had evicted the recovered animal 
 Option 1: One day he found an injured squirrel and brought it home to nurse. 
 Option 2: One day he found an injured bird and brought it home to nurse.