I know to do this for next timeLOL! Little bugger knows what's good!
Last time my tortoise partner visited here he planted an opuntia in my Russian yard, and he cut the bottom off a 5 gallon bucket to place around the cactus. A couple weeks after it was planted I thought, "Hm, these are just little tortoises, how much damage can they do to this cactus?" And I took away the bucket. Later I looked in on them and the poor cactus had many, many bites taken out of it. Needless to say, the bucket went back over the cactus!
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