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Happily, there are some animal-friendly alternatives (kiddies can go "to market, to market, to buy a ripe plum"), but if they aren't readily available, you can always improvise on the fly ("this little piggy ate tofu"!). The point is, keep an eye out for opportunities to be kind while you're teaching your kids to be creative. I leave you with the words of the wonderful little Spanish lullaby "Pio, Pio, Pio" (which is also the chorus sung by baby chicks) translated into English:
Almost all of us grew up eating meat, wearing leather, and going to circuses and zoos. We never considered the impact of these actions on the animals involved. For whatever reason, you are now asking the question: Why should animals have rights? Read more.