Most of the stuff that pet shops sell as food [or food base entertainment for small animals] can be used in 'small' quantities as treats. Those big dried corn cobs you're supposed to clip to the bars of their enclosure [which would be a ridiculous thing to do] can be broken down into individual corn nibblets. As single pieces of corn they make a great occasional treat, and as individual corn nibbles there also cheep, but rabbits can also be very greedy and incredibly manipulative. The most important thing is that they eat mostly hay. Everything else is pretty much just to keep them happy and entertained
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