Monkeys and Alcohol

A friend of mine sent this link to me. It's a BBC nature program that looks at monkey's drinking habits on St. Kitts.

Given that monkeys seem to have drinking patterns similar to those of humans -- most drink only moderately, others not at all, yet others to excess -- does this tell us anything about moral responsibility and addiction? Given that we have a non-human model, does this mean that the biological component should be weighed more heavily when comparing it to the that of volition?