A Boy Called Bat by Elana K. Arnold

Third grader Bixby Alexander Tam, nicknamed Bat, lives with his veterinarian mom and older sister. Bat likes order and animals, goes to a special school and when his mom brings home an orphaned baby skunk to take care of for a month, Bat must find a way to convince her he can take care of and possibly keep the skunk.  Children who enjoyed Wonder or Rain Reign will enjoy A Boy Called Bat

There is also a sequel called Bat and the Waiting Game!