Our planet is home to nearly 10 million animal species. Yet, what about the life forms that are invisible to us? How many ...

The typical human digestive tract is home to one of the densest communities of microorganisms on the planet. Bacteria dominate researchers’ attention, with the roles of other members of this ecosystem ...

A new study focused on cryptic species—animals that look the same but are genetically different—found that they’re more widespread among vertebrates than we previously thought.

Protists, eukaryotic unicellular organisms, play a crucial role in aquatic microbial food webs. Phagotrophic protists or ...