Link: https://www.bbc.com/news/world-us-canada-49598840
Joined at the body, the baby venomous snake has two fully-formed heads, four eyes and two flickering tongues - which work independently of each other.
"It would be pretty difficult for this snake to survive in the wild," environmentalist Dave Schneider said.
He said the snake stiffens when trying to escape, and it would have been an easy catch for predators.
Two-headed snakes are usually born the same way as conjoined twins: a developing embryo begins to split into identical twins - but then stops part way.
They came up with the name Double Dave because Mr Schneider and his colleague are both called David.