Yakari discovers a colony of beavers busy building their dam. There we find Thousand-mouths, the short-tempered building site boss; Dam-of-Wood, the smiling old wise man; Wooden-Bed, the sleepyhead; Double-Tooth, the eternally inspired sculptor...and last but not least Little Lime Tree, a lively kid. While they are bathing, this infernal little beaver disappears. Yakari will find him.