I had a gerbil way back when————he was a nice little,first pet for my kids.
I gave him one Cheerio every morning when I got up——and he’d be upright,waiting for it.
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I'll have him try that. So far it has been mainly a carrot diet. That gerbil must have the best eyesight in town by now.
When I had my Koi fish after winter hibernation and it warmed up I gave them cheerios. They loved them.