Filter feeder
A filter feeder is an organism, typically an animal, that captures food by straining tiny particles like plankton or detritus from water using specialized structures. These creatures are essential in aquatic environments for recycling nutrients and maintaining ecological balance, and in human applications, they're increasingly valued for their role in natural water filtration systems like oyster reefs.
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The blue whale, the largest animal on Earth, sustains itself as a filter feeder by engulfing up to 2,000 liters of water at a time and filtering out about 40 million krill daily, allowing it to gain massive energy without the need for high-speed chases. This efficient strategy has enabled filter feeders to dominate ocean ecosystems for over 500 million years, outlasting many predatory species.
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