Perky Otter - Let's Read Together Author:Barbara Derubertis In Perky Otter the focus is on the vowel team sound of er (spelled er, ir, or, and ur). Perky Otter and busy Bert the Beaver learn that they have a few things in common after all! 32 pages, 6 1/2 x 9, Audio Cassette: Side A: Read-Along, Side B: Listening, Ages 4-8