Simian twins Chimp and Zee return, bounding out of bed and into a birthday mini-adventure. Clad in jammies and closely attended by “Mumkey” and “Papakey,” the two zoom on new scooters through bright, leafy landscapes on their way into Jungletown for “the most enormous, stripiest Birthday Surprise of all”—a double gatefold tent with a party set up inside. It’s the wildest birthday celebration since John Archambault’s Boom Chicka Rock, illustrated by Suzanne Tanner Chitwood (2004), and though Chimp and Zee are temporarily led astray by a “shortcut” into Slimy Swamp, young monkeys of the human sort will happily “go bananas” along with them. (Picture book. 4-6)