Viewers have been stunned by the video of woodland surface rising and falling as if it has a pair of lungs.
The eerie footage was captured by Brian Nuttall at Apple River in Nova Scotia.
Thousands of people on Facebook have been stunned by the phenomenon – and are struggling to come up with an answer.
Some say it is a sink hole while others suggest it is a stream under the ground.
https://www.youtube.com/watch?v=njTmKCPEXwY Nuttall said in his Facebook post: “The wind was blowing the trees on the hill a few days after the remanence of hurricane Patricia, it was a strong west wind.
“I walked across a choppins that was logged a few years back.
“As I entered a patch of trees spared from clear cutting, I noticed the ground moving. I believe the larger trees are doomed to blow down but are currently spared, the smaller trees around them help hold each other up, as the wind pushes the trees into one another.
“I feel the trees didn’t grow deep strong roots as they wouldn’t be needed when surrounded by a forest, sheltered with strength in numbers unlike a tree found alone in a pasture. BRIAN NUTTALL/FACEBOOK “The punishing prevailing winds have taken their toll on the side hill, the roots have loosened and the mossy ground from the once shaded forest floor are giving way, soon to be toppled over.
“The ground is dry on the side hill, all gravel with shallow top soil(4 to 6 inches) for roots, not wet, no underground rivers.”
It comes just days after the discovery of a weird alien-type creature got the whole web talking.