James Geist has spotted pythons twice within days in his West Milford yard.
Geist was reading on his deck when he thought he saw a branch move on July 23.
He soon realized it was a snake.
"I freaked out and called up the West Milford police," said Geist.
Police arrived with two snake handlers who told Geist the branch was a 15-foot albino python.
Geist said the snake was huge, thick and docile.
"They were concerned about black bears," he said of the responding officers. "I would rather run into a black bear than a python."
Four days later, Geist saw another snake.
This time it was a 10-foot python.
It had slithered into the yard and was resting near a lawn chair.
Animal control believes the tropical snakes were released by someone who had moved from the neighborhood.
It is not illegal to own a python in the state of New Jersey, but owners must own an exotic pet permit.
Police estimate the two pythons found in Geist's yard were worth more than $10,000 together.