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Blue whales are baleen skimmer , which means they have fringed plates of fingernail-like material, called baleen, attached to their upper jaws. All baleen whales have baleen instead of teeth which they use to collect shrimp-like krill, plankton and small fish from the sea. These bristly baleen plates filter, sift, sieve or trap the whales' favourite prey from seawater inside their mouths.