the nice thing about having the longer bottom. as in tomcats pics/dimensions is its easy to nail too the tree.
the same can be done with tapered boxes.
boxes made from OSB get chewed up pretty fast. plywood is better, but milled lumber is the best. as far as wood goes. the chewing critters are attracted by the glue.
i stopped making them out of wood and have went with the plastic boxes/newspaper tubes as the bears keep ripping them down and ruining them. with the plastic, they can be just nailed back up.
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