-
11
Orcinus orca (11 million years ago)
The modern day whale. -
34
Llanocetus (34 million years ago)
Teeth were reduced and elbows became immobile. First evidence of baleen for fish feeding was found. -
40
Basilosaurus (40-34 million years ago)
Very long and snakelike, tail ends with a small fluke. -
41
Dorudon (41-33 million years ago)
Completely aquatic - forelimbs became flippers, trunk was elongated, hind limbs shrunk in size, tail flukes evolved, and nostrils moved farther back of the skull. -
47
Maiacetus (47 million years ago)
Sea-lion like but spent some time on land. Forelimbs were for walking and swimming while hind limbs were big in size. -
49
Ambulocetus (49 million years ago)
Had a more aquatic lifestyle; tail was longer and more muscular, shorter legs, enlarged paddle-like feet and hands. It was alligator-like and fed in the both salt and freshwater. -
50
Pakicetus (50 million years ago)
Quite small land animals with long skulls, big carnivorous teeth, nostrils far in front, limbs for walking, and no tail flukes.
