Hector flies a kite. Marsu in his high spirits tears off the string and the kite sails away. In search of the dragon, Marsu punches a hole in the spiny shell of a giant tree. Inside the tree, which is totally hollow, is a mini-jungle that was previously completely isolated from the outside world. In this mini jungle there are the same animals as outside, just much smaller. Hector and Marsu take three little monkeys home with them, but they are also followed by a parrot, two jaguars and a tapir. At the camp, little Marsus have a lot of fun with the mini animals and Hector builds them a cage so they can spend the night in a safe place. But in the morning, Hector and Marsu find out that the monkeys have dismantled the cage and the animals have disappeared.