Bryozoans are always colonial and almost always live in marine environments.
Bryozoans are filter feeders, so prefer clear water to live in.
The individual in the colony is referred to as the zooid. It is usually about one mm in length. But a colony can be as large as two feet across. So a colony may be made up anywhere from a few to millions of zooids. Autozooids are responsible for the feeding, gonozooids specialize in reproduction, the avicularium is the individual that acts as the defense for the colony, the vibraculum keeps the colony clear from sediment, and the kenozooid is a structural individual for building of the colony.