Prafulla Sahu a resident of Buguda in eastern India, was terrified when he spotted a huge snake inside his house on March 24.

Although he couldn't identify the snake, he knew that it was very big and dangerous.

He called a local Snake Helpline volunteer, Harish Padhy.

Harish carefully caught the 13-feet long king cobra and then took it to a nearby forest in the presence of forest officials.

As the men watched in surprise, the snake regurgitated a monitor lizard.

The king cobra then swam across a pond and vanished.

Snake Helpline founder Subhendu Malik said: "Though king cobra is known for eating other snakes, it also occasionally preys on other animals like monitor lizards."

Snakes usually regurgitate when stressed as it helps them to make a quick getaway.