Night callers

Each night at around ten we get roused from our pre-bedtime doze by loud rapping on our galley side hatch plastic window.
Bang, bang, bang it goes - loud enough to make you jump.
But it's just our night callers, the local family of swans - ma, pa and two youngsters - rapping for their supper.
I must admit I'm not generally a great fan of swans. Beautiful they may be but they shove in front of any other water birds if there is grub around – and then thank you for your offering with some aggressive hissing and threatening. But this noisy family are the exception with their noisy nightly calling.