I wasn't sure i had anything fitting the topic, Anger. I think I tend to avoid topics like that, on the whole.
Then I remembered a photo I'd taken of a crabby swan pecking at a juvenile swan. Swans are usually very serene looking birds but when they are angry, they can be very agressive.
During nesting season, they will sometimes drive away other birds, animals and even people. Some swans will attack canoes, rowing boats and jet skis if they intrude on the swan's territory.
Their large wingspan and considerable weight [15 kilos, over 30lbs] makes them quite formidable if they are in a bad mood.
We were told as kids that an angry swan could break someones arm , though I don't know of anyone that ever happened to. I suppose it was intended to make us back away if a swan ever started hissing at us.
The same swans in a more relaxed mood.