Different Types of Whales
Blue Whales
Blue whale is the largest as well as the loudest animal to live on earth. They can grow up to 105 feet long weighing up to 200 tons. Adult female blue whales are larger than adult males in size. They are generally found to be swimming in small groups or pairs.

4 tons of krill, tiny shrimp like animals is their diet for a day.
The daily requirement of an adult blue whale is in the region of 1.5 million kilocalories. A blue whale's tongue weighs around 2.7 metric tons, its mouth is large enough to hold up to 90 metric tons of food and water.
Orca Whales
Ocra whales also known as killer whales are one of the most powerful predators. They grow to be anywhere between 82 to 105 feet and can weigh up to 200 tons.

Their average lifespan in the wild is 80 to 90 years. Most of the times, they hunt together in pods of 40. They prey on marine mammals as well fish. They can even grab seals and polar bears right off the ice, using their four inches long teeth.
On average, a killer whale eats 227 kilograms each day.
Humpback Whales
One of the larger rorqual species, adults range in length from 39–52 ft and weigh approximately 40 tons. The humpback has a distinctive body shape, with unusually long pectoral fins and a knobbly head. It is an acrobatic animal, often breaching and slapping the water.

They are known for their magical songs, which they sing to communicate with others and to attract potential mates is quite complex and can continue for hours on end.
They are omnivore in their dietary habits, feeding on fish, plankton, and tiny shrimp-like krill. As well as other methods, rorqual whales obtain prey by lunge feeding on bait balls. Lunge feeding is an extreme feeding method, where the whale accelerates to a high velocity and then opens its mouths to a large gape angle. This generates the water pressure required to expand its mouth and engulf and filter a huge amount of water and fish.
Beluga Whales
This marine mammal is commonly referred to simply as the beluga or sea canary due to its high-pitched twitter. They are also called as white whales. They are found in the Arctic Ocean's coastal waters and in subarctic waters.

Males can reach 18 ft long, while females grow to 13 ft. Males weigh between 1,100 and 1,600 kilograms while females weigh between 700 and 1,200 kilograms .
They are social mammals, living and hunting together in small groups. They mostly hunt for schooling fishes, which are found in abundance in the coastal area. It also eats squid, octopus, crab and shrimp. 
Fin Whales
It's the second largest species of whale and the sixth largest living animal after the blue whale, bowhead whale, and right whales growing to nearly 88 ft long and can weigh up to 70 tons, commonly also known as the, 'greyhound of the sea', because of its speed.

Unlike other whales, they may not need any feed whole of winter, as they rely on their accumulated blubber for energy.
The fin whale is a filter-feeder, feeding on small schooling fish, squid, and crustaceans including mysids and krill.
Gray Whales
The gray whale is a baleen whale that migrates between feeding and breeding grounds yearly. It reaches a length of about 52 ft, a weight of 36 tonnes and lives 50–70 years.

They are often referred as great migrates, they can swim 12,430 miles round-trip from the Alaskan waters to the Mexican coast.
Traveling night and day, the gray whale averages approximately 120 kilometers (75 mi) per day at an average speed of 8 kilometers per hour.

They are the most primitive of all whales, mottled gray and covered with abundant abrasions, scars and clusters of parasitic barnacles on their heads and backs.They are omnivore in nature and generally feed on amphipod crustaceans. They are fiercely protective of their Young ones. Calf gray whales drink fifty to eighty gallons of their mother's 53% fat milk per day.
Sperm Whales

The whale was named after a milky white waxy substance, believed to be sperm, found in its own head. It has the largest brain, found in any animal in the world.

The sperm whale has 20 to 26 teeth on each side of its lower jaw.The teeth are cone-shaped and weigh up to 1 kilogram.

They can grow up to 59 feet and weigh around 35 to 45 tons. Sperm Whales usually dive between 300 to 800 metres, and sometimes 1–2 kilometres to search for food.Such dives can last more than an hour.They feed on several species, notably the giant squid, the colossal squid, octopuses, and diverse fish like demersal rays, but the main part of their diet consists of medium-sized squid.

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