Do swans have venom when they hiss?

That's the natural way they ward of predators and anyone that gets to close to the territory, especially if they are raising the young. They also give a nasty peck which i have experienced on a few ocassions. That's the natural way they ward of predators and anyone that gets to close to the territory, especially if they are raising the young. They also give a nasty peck which i have experienced on a few ocassions.