Mud Flats
Phytoplankton and zooplankton are abundant. So are mud snails. Animals like oysters and clams that filter-feed live in mud flats because of the availability of plankton. Fish and crabs move through the flats at high tide. Birds and predatory animals visit tidal flats at specific times for their catch. About one inch below the surface of the mud, burrowing animals such as clams, worms, and crustaceans can be found. Because there is little or no oxygen, they breathe through tubes to get oxygen from the surface.
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