In the lab, when upside-down jellyfish were agitated or eating, they released clouds of mucus. Microscopic views showed that the mucus was filled with what Ames calls a “spider web of things ...

jellyfish-like creatures. Brown hydras are microscopic organisms found in ponds, rivers and lakes, measuring about 25mm in length. This study, "De novo evolution of transmissible tumors in hydra ...

Sponges are among the simplest animals, lacking a nervous system, brain, and digestive system. They filter water to get ...

A jellyfish sting causes red or purple skin ... it's best to avoid walking on it because it may drive any microscopic barbs from the sting farther into your skin, causing more pain.

A Man o’ War jellyfish's tentacles contain stinging nematocysts and microscopic capsules, which are loaded with coiled, barbed tubes that deliver venom capable of paralysing and killing small fish.