A terrifying video has surfaced from Russia of two swans attacking a swimmer.<br /><br />In the clip, which was filmed a couple of years ago, a man plunges into the pond for a swim and is immediately set upon by the birds.<br /><br />The swimmer is forced to duck under the water to avoid their pecks and tries to fend them off when he resurfaces.<br /><br />Neither the simmer nor the swans were hurt in the attack.<br /><br />According to ornithologists, swans can be very aggressive when defending a nest.
