Mysticeti whales (also known as baleen, or mustached whales) are filter feeders that have baleen, a sieve-like device use for filter feeding krill, copepods, and small fish. They are the largest whales and have 2 blowholes. Mysticeti whales include blue, gray, humpback, minke, bowhead, and right whales. Many Mysticeti species are endangered. Zoom Whales Whale Glossary U-Z Enchanted Learning® Over 20,000 Web Pages. Sample Pages for Prospective Subscribers