🦷While some whales have teeth as big as a slice of pizza, others have none. Instead, those whales have baleen—a hard, fringed material that hangs from each side of the roof of the mouth like vertical blinds.

🐋Baleen is no sorry replacement for teeth, though—it is an extremely efficient filter-feeding device that works like a gigantic sieve to capture tiny crustaceans and fish.

Photo: Teddy Llovet, CC BY-NC 2.0, flickr

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