Today Caillou discovers the wonders of the natural world. Grandma introduces Caillou to the many birds that live in the park, and then gives him a bird house for his own backyard. That's why Caillou's prepared when he and Sarah find a baby bird that's fallen from its nest, and they nurse it back to health. Later, Caillou and his daycare buddies have a treasure hunt in the forest. With Sarah and a magnifying glass, Caillou pretends to be a jungle explorer, hunting "big game" in the garden. On another day, Caillou and his family go away for a weekend of camping in the woods. He climbs a mountain with Daddy and really, really hopes he will get to see a moose before it is time to go home.