The British Trust for Ornithology states that Bird Protection Law permits the cleaning out of nesting boxes between 1 August and 31 January and as there are seven nesting boxes in Ruth’s large garden and she doesn’t like going up ladders, at the end of September she asked me to help her clean them out. Armed with gloves, a nest collecting bucket, a stiff brush and a ladder we set off, eager to see how many had been used and what the nests looked like.
Some were easier to get at than others; one was high up and almost entirely hidden by ivy, with only the entrance hole to be seen, whilst another was attached to a mature yew tree surrounded by a dense thicket of Symphoricarpos.
All the boxes were made by Ruth’s husband, a skilled carpenter, and were easily accessible at the base, which swivelled out to allow cleaning. The entrance holes were surrounded by a metal plate to prevent woodpeckers enlarging the hole and reaching in to take young birds.
Made with care and attention by Ruth’s husband, Fred
As we made our way around the garden, opening boxes, removing the contents, giving the inside a quick scrub, the old nests piled up in the bucket. In the end, we found that five of the boxes had been used and were fascinated to see their variety.
All had a base of moss topped by a mixture of wool and other material, but one nest, with shell fragments showing it was used by a Great tit (Parus major), had a particularly deep and luxuriant foundation of moss, topped by a thick layer of wool. It looked so cosy – imagine being born surrounded by that softness.
In contrast another nest, whilst clearly used, had a fairly thin foundation of moss and very little wool. Yet another had been finished with downy feathers and a single unhatched egg showed it had been used by a blue tit (Cyanistes caeruleus).
All this cleaning activity begs the question, why clean out nesting boxes? A piece in The Telegraph suggests that it doesn’t really matter and that birds don’t really mind. It’s a thought provoking article, but unfortunately the studies mentioned are not named or linked to, so it isn’t possible to read them. Over on the RSPB website, the cleaning of nesting boxes is recommended: ‘The nests of most birds harbour fleas and other parasites, which remain to infest young birds that hatch the following year. We recommend that old nests be removed in the autumn, from August onwards once the birds have stopped using the box’. Take your pick, but if Ruth wants to clean out the nesting boxes that’s fine with me. We didn’t destroy the nests, incidentally, we tucked them under hedges around the garden so that other creatures can make use of the materials. That or they will gently compost into the earth.