A Dunsborough resident had the surprise of her life when a two-headed, four-armed bobtail lizard was born in her backyard.

When Jo heard rustling out the back of her semi-rural home on Monday, she first thought it was a snake, but relaxed when she saw a bobtail move on from the spot.

But when the rustling continued she investigated further and noticed two newborn bobtails, clearly only minutes old.

What she thought were two more babies were struggling under a log and seemed stuck in the sand, but as she helped to move the "fourth" lizard she realised the third bobtail actually had two heads and two extra arms.