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Wise in the ways of the pool, Carefully in the pool?
oxpeckers, on their floating islands, drink safely,
and these unpredictable giants don't seem to mind the few extra
ounces of their company.
Comments  
MadhulkWise in the ways of the pool, Carefully in the pool? In this context, probably that they understand the dangers & how to avoid them. In other contexts it could mean that someone understands how to avoid being duped, or understands the etiquette reuired in a situation, or how to get the best out of a situation.

oxpeckers, on their floating islands, drink safely,
and these unpredictable giants don't seem to mind the few extra
ounces of their company.

Thank you, KateJS!