The blue whale is the world's largest animal. National Marine Mammal Laboratory scientists measured the longest whale with length of 29.9 meters, about the same length as a Boeing 737 or three double-decker buses. Blue whale's head is very large, 50 people can stand on the tongue. It's as big as the heart and cars. Baby can climb its artery. During the first seven months of a blue whale's life, it can drink 400 liters milk per day.
A male African elephant can reach 8 meters in length and weigh 8 tons when it grows to about fifteen years old. There are two years of breast feeding period when an African elephant is born, it reaches the marriage time when it is twelve to fifteen years old, its life can last twenty-four to twenty-six years.
The polar bear is the world's largest land carnivore, male polar bears in length about 240-260cm, weight is generally 400-800 kg. The shape of female polar bears is smaller than males, about half, body length 190-210cm, weighs about 200-300 kg. Before the arrival of winter, due to the massive accumulation of fat, their body weight could increase up to 500 kg.
Saltwater crocodile is the world's largest extant reptiles, its distribution area is in Southeast Asia and northern Australia. The average adult male crocodile's length could reach 4.8 to 5.5 meters and weigh 770 kg. Female crocodile is much smaller than males, usually in body length between 2.5 to 3 meters.
Giraffes live in Africa, it is an unique animal with very long neck that could reach a maximum of 6 meters tall. It is thus the highest land animals. According to paleontologists study, giraffe originated in Asia from three million years ago.
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