Elephants can hear one another's trumpeting calls up to 5 miles (8 kilometers) away. The largest elephant on record weighed about 24,000 pounds (10,886 kg) with a height of 13 feet (3.96 m). Elephants can get sunburned so they protect themselves with sand. About 100 elephants are being killed every day for their ivory. African elephants have the best sense of smell in the animal kingdom. Edison electrocuted an elephant in 1903 to prove Tesla's AC current was dangerous. When the "Elephant Whisperer" Lawrence Anthony died, a herd of elephants arrived at his house to mourn him. Elephants are scared of bees. Africa is home to the world's largest living land animal, the African elephant, and the tallest, the Giraffe. Elephants are the only mammals, besides humans, to have chins. Elephants normally only sleep 2 or 3 hours each day. An adult elephant requires up to 300 kg of food and 160 litres of water per day. An elephant's pair of tusks may exceed 441 pounds (200 kg). 96 elephants are killed every day in Africa. African elephants can distinguish human languages, genders and ages associated with danger. Elephants are pregnant for 2 years. An elephant can smell water from 12 miles away. On one episode of "Price Is Right," an elephant was offered as a "bonus prize." The contestant won, insisted on the prize, and a live elephant from Kenya had to be delivered to him. One of the world's most expensive coffee brands is made from the dung of Thai elephants. Elephants can differentiate between men and women, and between different ethnicities, when they hear a voice. Elephants can detect rain 150 miles away. Elephant brains can weigh as much as 5 KG (11 LB), more than the brain of any other land animal. Mouse sperm is larger than elephant sperm. Dogs and elephants are the only animals that seem to instinctively understand pointing. Elephants and chimpanzees can display behavior patterns similar to post-traumatic stress disorder and depression. Female elephants have the longest reproductive anatomy of any land mammal: her vagina is located 1.3 meters into her body. Elephants rarely get cancer because they have 40 copies of genes that code for the tumor suppressor protein p53—humans have two. Elephants know to come to humans for help (like if they've been poisoned) and can find us even over long distances. Elephants have 3 times the number of neurons that humans have, and no-one knows why they aren't smarter than us. An adult Asian elephant is capable of holding 8.5 L (2.2 US gal) of water in its trunk. An elephant's trunk has more than 40,000 muscles. In comparison a human being only has 639 muscles total. African elephants can disperse — with their dung — over 2000 seeds of diverse plants per square kilometre, every day. With its trunk, an elephant can reach items at heights of up to 7 m (23 ft) and dig for water under mud or sand. Elephants don't like peanuts. An elephant's skin can be up to 1 inch (2.54 centimeters) thick but is so sensitive it can feel a fly landing on it. Elephant polo is a popular sport in India, Nepal and Thailand. 40% of captive African elephants are obese.