Is the female geese aggressive

I can only speak for the Canada Geese because they are the species I am studying. First, not all Canadas are aggressive. The elders and the males are the most protective of the group. And the term to use is "protective" not "aggressive". They are protecting their families much the same way a father or grandfather would protect his children. But the level of protectiveness depends on the individual. Geese who are used to people won't be so sensitive because they know what people are and that they will not hurt them. Country geese will be the opposite.

If a goose hisses at you he is telling you to back off because he doesn't know you and that frightens him. Now, that doesn't mean that you should go up to him and give him a big hug and tell him everything will be alright! When you get the hiss take a few steps back and stand still. Wait a minute or two and when he realizes you pose him no threat he will calm down. And tossing him a treat or two at that moment may not just ease tensions but may start a wonderful friendship!