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Monterey Aquarium.
anemones
Aggregating anemones, elegant flowerlike animals, have a tube-shaped body crowned with tentacles. Two types of microscopic algae live in the anemones' tissues and give them their green color—anemones without algae are white. The algae supply food to the anemones, and the anemones bend toward or away from the light to provide the algae with the proper amount of light needed for photosynthesis.
Anemones are voracious feeders that eat almost anything. Stinging cells (nematocysts) on their tentacles paralyze small prey animals. Anemones can even ingest small crabs and then spew out the shells. Original public domain image from Flickr
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