Something is making mischief at the zoo, leaving a trail of purple paw prints in its wake. Could it be whomever slept in Elephant-s straw, drank Lion-s milk, pooped in Ostrich-s sandbox, and scratched on Giraffe-s favorite tree? As the victims come forward and express their growing fears to the zookeeper, the list of adjectives describing the possible perpetrator grows as well. Their anxious cumulative conclusion (-It was definitely a monster. A very sleepy, very thirsty, very stinky, very SCRATCHY monster-) is accompanied by a drawing of a somnambulistic purple creature with four arms, a green tongue, and a yellow horn who seems capable of any number of crimes. Finally the culprit is revealed: a cute kitten who walked through some purple paint-though goldfish Goldie (-But, guys, it tried to eat me!-) is unconvinced that the kitty-s intentions are wholly benign. App creator Gallanosa makes a confident picture book debut, with solid comic timing and a skillful wielding of tried-and-true