If you come across one of these goopy colonies, don't fear! While they may be gross, they are native to the Great Lakes and ...

They're not really individuals: Bryozoans are made up of dozens to thousands of microscopic "zooids" that live together in a ...

A cormidium contains zooids for feeding (gastrozooids), others for buoyancy (bracts) and yet others for reproduction (gonophores). Gastrozooids are muscular tubes attached to the stem at one end and ...