Gr 4 Up-Long ago, an ancient tribe of macaque monkeys migrated further north than any other primate besides man. They settled in the Japanese Alps (the Shiga Highlands) and adjusted to the frigid temperatures and deep snows of winter where the heated volcanic waters feeding the Yokoyu River kept it ice-free year-round. Referred to as snow monkeys, a troop of about 160 descends daily from the mountains into Jigokudani (Hell Valley), where their winter diet is supplemented with grain provided by humans and a special hot springs, built expressly for their use. Producer and cinematographer Joe Pontecorvo and his wife, Nimmida, spent nearly two years observing and recording the daily lives of this troop and witnessed some unexpected behavior. Focusing on social hierarchy and group dynamics, the film highlights the progress of a young, low-ranking male as he establishes a remarkable bond with the anti-social alpha male. An unmistakable element of anthropomorphism can be forgiven in light of scenes of playful youngsters catching snowflakes on their tongues, making snowballs for play, or dumping snow on the heads of mothers hoping to sleep in. Actor Liam Neeson's rich voice provides the informative narrative and combines beautifully with Jerry Zuckerman's perfectly modulated musical score to enhance the breathtaking cinematography. Public libraries will want this for family viewing, and teachers will find it useful for units on animal behavior and adaptation. A short, supplemental video available at PBS.org provides behind-the-scenes footage is well worth viewing.-Cary Frostick, formerly with Mary Riley Styles Public Library, Falls Church, VA (c) Copyright 2012. Library Journals LLC, a wholly owned subsidiary of Media Source, Inc. No redistribution permitted.