Baby animal interactions

Do baby animals play with each other? I have two lion cubs right now, and they play with their parents a lot, but I've never seen them interact with each other. They also have an older, adult sister who I haven't seen them interact with. Are baby interactions with adults only reserved for parents?
 
I saw two wolf pups playing. I guess it depends on species, some might have interactions with other pups and some might not.
 
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