Not sure on the history of it, you can read wikipedia for that im sure.
But for pigs i imagine it had to do with the shape? For a coin-bank you want something big and capable of holding a fair amount, and a rounded shape is beneficial for many reasons. Size of interior, no corners to become structural weakpoints, naturally balances as coins slide to the bottom with no corners to get stuck on, etc.
So when you start with a round shape and think of animals… pig comes up quickly. Cant really do a tiger lol, wouldn’t look right. Everyone knows pigs, cartoony pigs look cute, it appeals to kids both boys and girls. Elephant could have been another obvious choice but pigs are more common in most of the world.
Then, once it catches popularity and enters the zeitgeist, people copy and that keeps compounding until it’s ubiquitous.
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