In the company of Alberto Angela we travel in the middle of the tropical jungle, the green ring straddling the Equator between the Tropic of Cancer and that of Capricorn. This is 8% of the emerged land of our planet and it is our lungs: the tropical forest is one of the environments richest in life on the planet. It has been calculated that on an area of a few square kilometers of forest in Central America, 125 species of mammals, 400 species of birds, 100 species of reptiles, 60 species of amphibians and almost 40,000 species of insects can be found. Among them there are legendary animals such as tarantulas, which can reach 12 cm in length, the anaconda which can reach 8 meters and the boa constrictor which reaches 2 and a half metres. Then there are felines such as the jaguar in America, the leopard and the tiger in Asia.