"The Chimpanzees of Happytown"
There is a book right along these same lines by Giles Andreae and Guy Parker-Rees called "The Chimpanzees of Happytown". It is secular and doesn't make the tie to Christmas, but a great teacher could tie it in and make it work. The illustrations are awesome, and it reads really well! Published by Scholastic.
Here is a link of the book being read https://www.youtube.com/watch?v=yFuQmUIRfPg