Matt, Sam, and the Swimming Unicorn

Soft cover. Written by Elizabeth Ann Harlan. Comes with stickers.
 
Matt, Sam, and the Swimming Unicorn is a light-hearted, humorous look at overcoming differences when making friends. Matt (a llama) and Sam (a sloth) enjoy exploring the zoo at night. One night, they meet a new friend who is very different from them. Together the three of them learned to help each other and learn to play together.