How I Became a Pirate, Yves-Marie Clément, Charles Villoutreix

Because their uncle, Captain Chicken, has taken up the challenge issued by a formidable pirate, Esméralda and Tim find themselves embarked on a ship and then on a giant anaconda hunt in the Amazon! But how can they outwit the countless traps that lie in wait for them at sea and on land, and claim the ten thousand gold pieces promised as a reward?