Since its inception, nuclear energy has faced a host of opposition, from oil conglomerates to well-intentioned anti-nuclear-weapons activists to environmental groups. As it turns out, even ocean critters are getting in on the movement.

Four of the six nuclear reactors at France's Gravelines nuclear power plant were shut down after an intake pipe used to draw water for cooling from a canal became clogged with jellyfish, Reuters reported.

A swarm of jellyfish forced a nuclear power plant to shut down four reactors after the animals were found in the plant’s cooling systems. It was called a “massive and unpredictable presence of jellyfish,” The New York Times reported.