The One and Only Ivan (The One and Only Ivan, #1)

by Katherine Applegate

“What’s the difference between the word spelled P-R-I-N-C-I-P-A-L and the one spelled P-R-I-N-C-I-P-L-E?” “The first one is the head of a school, like Ms. Garcia. The second one is a belief that helps you know what’s right or wrong.”