They’re wiggly and slimy and live inside the flesh of other animals. Now, scientists are making a new case for why they should be saved.

Parasites play crucial roles in ecosystems around the world, making up around 40% of animal species. As wildlife faces the growing threats of climate change and habitat loss, scientists warn that parasites are equally vulnerable.

That’s why a team of scientists has released a “global parasite conservation plan.”

“Parasites have a major public relations problem,” says Chelsea Wood, assistant professor at the University of Washington’s School of Aquatic and Fishery Sciences. “Most people don’t really like thinking about them, but the fact is they’re really important in ecosystems.”

And that’s the good news!