A cattail has a few roles in a Marsh, such as providing a place for certain animals to make a nest to lay their eggs in or to give an animal a home such as a frog.

Give animals nutrients and a place to build and hide a nest as well as can be used as protection.

Provide a food source for certain animals.

The Mangrove trees gives nutrients to animals when the y feed off of the tree or eat the grass around the tree.