In the Beginning look a bit like fish, but they are actually The story starts 55 million years ago with different from the enormous meat-eaters­ time to become better suited to new . They breathe air and baby whales a small, long-legged scurrying­ that whales are today, but they are related. environments. Follow the trail of drink milk from their mothers. Other mammals about the forest floor. This -sized plant- This is an example of evolution, which is on their journey from the land to the live on land, so how did an air-breathing eater could hardly have looked more the way living things change slowly over sea and ­discover how whales came to be. come to live in the sea?

Ambulocetus Ambulocetus probably behaved like a crocodile, lurking in shallow water and lunging out to catch land animals.

Indohyus Dorudon Indohyus lived on land near Dorudon probably swam like Length: up to 10 feet (3 meters) streams and rivers. Its heavy a and hunted fish. bones meant it could have Short legs. It could not walk on land at all. sunk out of sight of predators Webbed, paddle-like paws. Thick, powerful tail. and run along the river bottom.

Length: up to 16 feet (5 meters)

Wide, paddle-like flippers. Tiny back legs. Length: up to 2 feet (0.6 meters) Strong tail with small flukes. Long front and back legs. Hooves, like a or deer. Long tail.

About 55 million years ago About 49 million years ago About 40 million years ago 10 11