POLAR BEAR MATH

Bickel, a veterinary assistant at the Denver Zoo, and Nagda team up again for some animal math in this charming account of two abandoned polar bear cubs. When the newborn bears are discovered, the race for their survival begins. (Two-thirds of all polar bear mothers give birth to twins.) Dr. Kenny, the zoo’s vet, and assistants Cindy and Denny take turns feeding the babies around the clock, but have to guess what they should eat. (One-third puppy milk plus two-thirds half-and-half makes one batch of the first attempt at bear milk.) At first the cubs don’t grow well, but thanks to dedicated attention they soon outgrow their human caregivers. (Adult Snow weighs half as much as adult Klondike.) Terrific photos of the bears, from helpless newborns to active adults, illustrate the bear narrative. The fraction lessons are presented on opposing pages so they can be incorporated into the story or ignored. (Picture book/nonfiction. 6-10)