Should I clean out my bird box?

Don't birds clear out their own nest boxes?

Some birds will clean a nest site before starting a nest, while others will use an existing nest or simply build theirs on top of it. Remember that nest-building is labour-intensive work and if there's already a nest there, there's the temptation to take a short cut and use some or all of it in nest building. However, while saving the birds time, this may not actually be in their best interests.

But we don't clear out bird nests in the wild?

In the wild, many birds make nests in holes in trees. Some people argue that we shouldn't need to clean nest boxes because nest holes in trees are not cleaned. However, it's worth remembering that nest sites in trees are more commonplace than garden nest boxes, so there's less pressure on birds to nest in the same spot in consecutive years. Also remember that trees are living beings – bird nests will gradually break down in the tree. There's some evidence to suggest the nest even feeds the tree as it breaks down. So bird nests in tree holes are self cleaning.

When should I clean my nest box?

Clean out your nest box between September and December. In September you can be sure that birds are no longer using the nest, while January is the time birds start prospecting for new nest sites, so it's important not to disturb potential nest sites at this time.

How do I clean out a nest box?

Take down the box and remove the nest. Use a dust pan and brush to remove any remaining bits of feather and nest material. This is a good time to check over the box and make sure it's fit for next year's chicks – is it snug? Are there any rotting parts that need replacing? Have woodpeckers damaged the hole? Finally, pour boiling water into the nest to remove any lingering mites or parasites. Leave to dry and then fix it firmly back in place, for the birds to find the following spring.