It is scarcely possible to imagine the size of the blue whale, the largest animal inhabiting the earth. Its heart alone is as large as a small car.
Blue whales are an overall blue-gray color, mottled with light gray.
Blue whales are long and streamlined. The dorsal fin is extremely small, and the pectoral flippers are long and thin. Blue whales swim individually or in small groups. Pairs are very commonly seen. Approximately 2,000 blue whales live off the waters of California and Mexico.