Baleens look like the teeth of a comb. Which hang from the upper jaw. Blue whale is a baleen whale. It is about 100 feet long. Right whale, Gray whale are all baleen whales.
Baleen whales eat lots of small animals called krill.
Krill are small shrimp-like creatures. Baleen whales push out the water through the baleens, straining the krill to be swallowed later on.