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[size=12]my friends tell me to let my turtle go on a walk in my house
is it a good idea
they are only about as big as a toonie
and if it is should i put them in a hamster ball

It's not a good idea. Hamster ball? No, dont do that..it will stress your turtle out too much.

hamster ball? i don't think that's a good idea..they will just be very stressed out/pissed off in my opinion

I take my turtles out for walks inside the house, but be VERY careful because they can dissapear in the blink of an eye, that's why i mostly take one turtle at a time or have another someone help me keep an eye on the other one.

Napoleon's just stupid sometimes walking off edges like he can fly or something, stupid turtle.

i also think that a hamster ball is a bad idea...too stressy for a turtle.
i asked the same question that you did and i found out that turtles (some) enjoy the strech and the walk.
i also found out that water turtles can survive up to 9hours without water!
be carfull and keep a close eye on your turtle(s), most people say that turtles are slow like on the cartoons, but that is not true. turtles are quite quick and full of energy, also very good hiders and climbers.
enjoy!