Nearly 850 species of parasites are known to infect people; some, like the potentially deadly plasmodium parasite that causes ...

When Chelsea Wood was a child, she would often collect Periwinkle snails on the shores of Long Island. “I used to pluck them off the rocks and put them in buckets and keep them as pets and then ...

Cleaner wrasses (Labroides dimidiatus) thrive in coral reefs around the world. But they’re more than just another pretty face ...

We report on a new study from France, which indicates that dogs and cats may help to spread invasive flatworms.

Get your news from a source that’s not owned and controlled by oligarchs. Sign up for the free Mother Jones Daily. When Chelsea Wood was a child, she would often collect Periwinkle snails on the ...

Here’s a comforting thought: you might not actually be alone in your own body right now. Parasites are far more common than most people realize, and they don’t care about your personal boundaries, ...

A new study identifies an extreme but effective way that brain immune cells can prevent the parasite Toxoplasma gondii from ...