Bleach can kill ants, but it is not a permanent solution. It will only work on the ants who have been exposed to the bleach. Leaving you wondering how to get rid of the nest. Also, there is an inherent health danger to yourself when using bleach.
Ground squirrels are burrowers and sleep in underground dens. Tree squirrels and flying squirrels prefer to transform cavities in trees or other structures into snug squirrel nests or dens. If they cannot find a suitable cavity to convert into a den, they will construct a woven dray high up in a tree fork or a clump of branches, where they can sleep safely.