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Professor Dave Explains
Phylum Cnidaria Part 2: Class Hydrozoa
As we now know, there are five major classes within phylum Cnidaria, and we will go through them one at a time. First up is class Hydrozoa. This contains a variety of small predatory polyps, such as hydras. These are fascinating...
Florida State University
Florida State University: Hydra (Coelenterata) Movie #2
In this short movie, you will observe two hydra fighting over prey. This interesting site also provides background information on hydra.