About 55 million years ago, wolf-like land mammals began to search and hunt for food in water, and they slowly evolved into what we know as the whales of today. This is an ancestor of modern cetaceans known as Zygorhiza kochii.
Baleen whales have no teeth, but they do have two blowholes.
Their filters are baleen plates, which are like huge fringed brushes growing down from the upper jaws. These are used to strain the food from the water. There are three species of Baleen whales. They are the Right whales, the Gray whale and the Rorquals. Rorquals are identified by their throat-grooves or pleats, which allow their throats to expand and gulp huge amounts of water.