Which of the following animals swallow its prey?
(a) Human beings
(b) Snakes
(c) Humming birds
(d) Ant

Correct Answer: (b) Snakes  

Explanation:

 The digestive system of snake consists of the oral cavity, esophagus, stomach, small intestine, caecum, colon, and cloaca.

The snake lubricate drenches the prey with saliva in its oral cavity. 

The prey is eventually pulled into the esophagus where it is crushed and pushed into the stomach with the help of muscular movement.

The stomach is thick-walled and spindle-shaped which digests the food completely and gets absorbed in the small intestine.