Mervin the Sloth is just standing there quietly when giant letters drop onto the page: “Mervin the Sloth is about to do the best thing in the world.” But what is the best thing in the world? What is Mervin about to do? It doesn’t take long for all of Mervin’s exuberant animal friends to barge in with their own ideas. Flying! Digging! Gazelling! Wait, gazelling? Is that even a word? If only sloths weren’t so slow! Because maybe it’s something even better. But only Amy the red panda sticks around to see it.