Erm..... bunnies are not humans. They would not understand why they were wearing ear plugs and would end up more confused and stressed.
The potential for them also causing real damage to their ear canals is fairly great I would think.
Would this happen even with soft ear plugs though?
They shouldn't be left in a situation where they're faced with constant noise! I think sorting that out would be the kindest and safest solution.
:shock::shock: