I think that a common misconception among tourists who visit the UK is that swans are peaceful animals. This is only true if you leave them alone. Unfortunately, I have seen mothers encouraging their children to approach swans and get quite close to them. This is a bad idea.
Swans are territorial creatures. Especially if they have cygnets (baby swans) with them. If they perceive you to be a threat to their children, they will not hesitate to attack you. They have been known to kill small dogs in self-defense and attack young children. Swans are big creatures and you should not underestimate the power of their talons / claws.
If you see a swan walking about, don't approach it. Slow your pace, avoid eye contact, and make sure to provide distance between yourself and the swan, otherwise the swan will feel threatened. If a swan starts making a growling sound and flapping its wings, this is a warning sign that the swan is about to become aggressive if you don't back off. Make sure you have your dog on a leash around swans.
Admire their grace from a distance. However, swans approaching take-off are far from graceful, they have to do a run-up on the water to actually build up enough momentum to hoist themselves up into the air. It takes a lot of effort for a swan to fly and usually takes multiple attempts to manage flight. This is down to the sheer body mass of swans, they must be one of the biggest birds that can fly. I think the most noticeable feature is their long necks. My cat is absolutely terrified of swans and I don't blame her. She runs inside and hides.
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