They are incredibly intelligent. Noticeable difference between my retics and my balls. They quickly pick up on patterns, and know when I am getting ready to feed them vs getting ready to clean them.
They also seem to love exercise. I get my retics out once a week and let them hangout out in the back yard.
Personality wise, they can run the gamut from completely tame and chill to extremely aggressive. I'm lucky enough to have very tame and friendly retics. But with their intelligence comes the ability to tag you if they so desire.
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