Considers the possibility that the world's jungles may still hold large unknown wild animals that have never been captured, such as a living dinosaur, a pygmy hippo, a giant forest hog, and a snake larger than the anaconda.
Explains the natural jungle homes for such animals as the sun bittern, frog, lizard, venomous snake, sloth, monkey, gorilla, wild cat, Bengal tiger, elephant, and cassowary.