In reply to Lankyman:
I once rescued a large male swan. The daft thing had somehow got its head stuck between railings and under some sticks, as soon as the sticks were lifted it could pull its head out from the railings. The problem was I only had access on the swan side of the railings so I had to stand beside it to free it.
Was it grateful?? Was it ****!
It went for me in full attack and as it chased me down the towpath enraged, 4 or 5 of its evil mates left the canal to join in. I didn't suffer a broken arm as they say, but I'm definitely not going to rush to the help of any swans in future