Nanoarchaeum equitans

Nanoarchaeum equitans is a very tiny organism that lives inside another organism called Ignicoccus hospitalis. Imagine Nanoarchaeum as a little person living inside a house that is inside another bigger house. It's so small that you need very special tools like microscopes to see it.

Nanoarchaeum cannot live by itself and it needs Ignicoccus to survive. The way it gets its food is by stealing it from Ignicoccus. Imagine that Ignicoccus has a fridge, and whenever it goes to get food, Nanoarchaeum sneaks up and takes some of that food for itself without Ignicoccus noticing.

Nanoarchaeum has a very unique feature in that it does not have the small ribosomal subunits that other organisms have. Ribosomes are responsible for putting together proteins, which are like building blocks for the body. So Nanoarchaeum steals these tiny subunits from Ignicoccus to help itself make proteins and grow.

Overall, Nanoarchaeum equitans is a very small but special organism that relies on another organism to survive and steals some of its resources to grow.