Most people think of pigs as mammals like perhaps elephants or hippos since they have hair and nurse their young but actually they are more closely related to marsupials like the platypus laying eggs in sandy nests much like lizards and crocodiles. Both the sows and boars guard the communal nests from predators. This varies from mammal reproduction. After hatching the sows nurse the young with specialized sweat glands similar to the way that mammals care for their young. This and the number of teats is why we don’t milk pigs.
When laid the eggs are quite leathery but they quickly harden to a very tough shell that is prized by Fabergé fans. Where as traditional bird eggs have a very small pore structure the pig eggs have a larger pore and thicker shell to deal with the higher metabolism of the pigs. Pigs are born with much stronger kicking muscles and “wolf” teeth to help them break out o the tough shells.
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