Pigs can be farmed as free range, being allowed to wander around a village, kept in fields, or tethered in a simple house.There are many different kinds of pig. Some pigs have a pink skin but there are brown, white and black skinned pigs too. Some pigs have patterns or spots. Something in skin called pigment makes the colour and it's different for different pig breeds.
Pigs do not sweat, so they wallow in mud to cool their bodies. The mud also protects a pig from insect bites and from sunburn.
Because they roll in mud, pigs often look mucky and people think that they are dirty animals. But pigs are clean animals!
In developed countries, farming has moved away from traditional pig farming and pigs are now typically intensively farmed. Today, pig farms are significantly larger than in the past, with most large-scale farms housing 5,000 or more pigs in climate-controlled buildings. With 100 million pigs slaughtered each year, these efficiencies deliver affordable meat for consumers and larger profits for producers.
Pigs have barrel shaped bodies. A pig can weigh up to 450 kilograms and can be 70 centimetres tall. Pigs have snouts, which help them find food by smell. They have an excellent sense of smell because they have poor eyesight. They have short tails that are often, but not always, curly. Pigs have hair on their bodies called bristles.
source - http://www.kidcyber.com.au/topics/farmpiggies.htm
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