Pigs are highly intelligent, curious and social. They have an excellent sense of smell, do not have sweat glands, and are omnivores, feeding on a wide variety of food that includes both plants and other animals. A pig’s snout is a highly-developed sense organ that enable it to detect food that is buried underground to a depth of 5 feet. Pigs also use their snouts for gathering information about the world around them.
In some parts of the world, wild boar, a species from which domestic pigs originate, are the main food source for larger predators such as tigers.
Pigs rank fourth in animal intelligence, just behind chimpanzees, dolphins and elephants. Because they are so smart, they learn quickly and can master tricks faster than dogs. Young piglets can learn their names and respond when called when they are just two or three weeks old. Pigs are highly social and form close bonds. When resting, it is not unusual to find them lying next to each other, in close contact.
Pigs use grunts to communicate. They also use a series of oinks and squeals, each with a distinct meaning. Because they have no sweat glands, pigs roll in mud to keep cool and protect their skin from the sun’s rays.They prefer water over mud and are surprisingly good swimmers. .