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 Little Lime Tree, a lively kid. While they are bathing, this infernal little beaver disappears.

Yakari discovers a colony of beavers busy building their dam. There we find Thousand-mouths, the short-tempered building site boss; Wooden-Dam, the smiling old wise man; Wooden-Bed, the sleepyhead; Double-Tooth, the eternally inspired sculptor... and last but not least Little Linden Tree, a lively kid. While they are bathing, this infernal little beaver disappears. Yakari will find him exploring the underground waterways of the river. Linden Tree will, of course, receive his first smacking (Rough-Bark, his father, is so worried!) and Double-Tooth will finally be able to present his masterpiece to the amazed colony.

When the beavers bring Yakari a battered old canoe, the young Sioux and his friends repair it and go for a little trip—and find more adventure than they bargained for, in the person of a father coyote. Fortunately, their new friend is up to his reputation for cunning: When Buffalo Seed is cornered by an angry puma, it will take all of the coyote’s tricks, combined with Yakari’s bravery, to get the young hunter out of his predicament.

There’s panic among the beavers. A pelican, fiendishly sick with a cold, makes an emergency landing among them. Not only does this undesirable guest keep all the neighbourhood awake with his monstrous sneezes, but he’s dying of hunger. Yakari and Little Thunder bring him to the otters, who cram him with fish. The pelican puts on weight again quickly, but his thundering cold persists!

When the beavers bring Yakari a battered old canoe, the young Sioux and his friends repair it and go for a little trip -- and find more adventure than they bargained for, in the person of a father coyote. Fortunately, their new friend is up to his reputation for cunning: when Buffalo Seed is cornered by an angry puma, it will take all of the coyote's tricks, combined with Yakari's bravery, to get the young hunter out of his predicament.

Something very serious is happening in the High Hills. Several animals have disappeared. A terrible grizzly has captured them and treats them as slaves, forcing them to find food for him. Arming himself with courage, Yakari bravely decides to face the vile tyrant. But how can a child stand before the wild animal? Great Eagle advises Yakari to wait for winter, when the bear, satiated, will sleep...

The Beavers are very worried: Linden Tree, Yakari’s yound and mischievous friend, has lost his appetite for ... well, everything. And his people have no time to devote to him, as they must repair their precious dam, damaged by heavy rains. While the young Sioux attempts to dispel his friend’s melancholy, Thousand-mouths suddenly realises he is several labourers short of a full work gang. Is something in the lake going after the hard-working beavers?