Matamata Turtles
The shell of the matamata turtle reminds one of rotten leaves and provides cover for the turtle when it is hunting for frogs.

Poison-dart Frog
It has a bright red color skin with yellow and blue areas. Natives from Costa Rica use a small amount of its poison from the skin and apply it to the tip of an arrow head - this makes it a dangerous weapon since 0.001 mg of this poison can kill a human

Extraordinary transparency of the male Glass Frog also makes it harder to distinguish from it's surroundings Burtons' Legless Lizard (Lialis burtonis)
Feeds on small lizards; can be distinguished by its elongated head. It is very swift and is often mistaken for a snake.

The Salt Water crocodile from East India is the most aggressive animal on earth. It can measure 20.5 feet (6.25 meters) and moves very fast through the water. Some have been known to attack native canoes 100 miles (160 km) out to sea and devour their occupants.

Fast moving waters and streams are usually inhabited by Piranhas. A person can swim relatively safely around the area as long as blood is not present and there is little splashing going on. Piranhas can strip a 100 lb 45 kg animal carcass in a few minutes.

The Candiro is a small fish, measuring 2 inches (5 cm), which inhabits the Brazilian rivers. It is attracted to urine and can enter human ureter and lodge itself in the bladder.