This drab pattern blends the snake in well with the wet, dense vegetations of its habitat. The sides have similar spots with yellow centers. The Yellow Anaconda is true to its name and is mostly yellow with similar black spots. The scales of the yellow and black underside of the lower tail on these Anacondas have a particular pattern which is unique to each snake. It's a form of identification, like a human fingerprint.
Snakes have a cavity called a cloaca which is where the intestinal and genitourinary tracks empty.
Anacondas have spurs on either side of the cloaca. The cloaca of the Anaconda has a gland which emits a foul-smelling musk. This brownish musk is quite poisonous to small organisms. This may prevent ticks and leeches from attaching themselves here. When Anacondas are out of the water for long periods of time they usually become infested with ticks.