Shelled Walnuts are a great boredom breakers for hamsters, keeping them busy through the night while trimming their teeth! The baked version has a shell which is more brittle as compared to the raw ones, lowering the cracking difficulty for your hamsters.
If you'd like to try a higher difficulty boredom breaker, try the raw version here!
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If your hamsters has difficulty breaking open the shell, you can use a nut cracker tool to slightly open it.