Best-selling illustrator Sara Ball is back with more mix-and-match fun—this time with sea creatures! In Flip-a-Fin, you get to combine the heads, bodies, and tails of ten different inhabitants of the deep—including a colorful clownfish, a glow-in-the-dark anglerfish, and a sword-nosed marlin—to create your own impossible beasts. Each flap features a fun fact about the pictured species, and inside the front cover is a chart showing the relative sizes of the featured ocean dwellers, from the seahorse to the blue whale.