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1. Marine mammals of the order Cetacea are known as whales. Whales are considered to be the descendants of land-living animals of the Artiodactyl order.
2. Whales are hunted for their meet and they are considered to be the source of some raw materials. Unfortunately, some whale species are seriously endangered due to the hunting and industrial whaling. Whaling is not practiced in the majority of countries. Norway, Japan and Iceland practice whaling.
3. Hippopotamuses and whales are the closest living relatives. Their common ancestor is Indohyus.
4. Whales became marine animals 50 million years ago.
5. Blue Whale is known as the largest mammal. Its 35 meters long and its mass is150 tons. The life expectancy of whales is between 40 and 90 years.
6. Some whales such as Sperm Whale have teeth.
7. Whales often sleep with one eye open.
8. Whales are predators. They eat large fishes and plankton.
9. The new born calves of Blue Whale are 6-7 meters long.
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