Nest surveys can be an important part of conservation – but must be carried out properly and with regard to the law. Survey work should not ordinarily cause any damage to nests, of course, but as described above there are issues to be aware of. The British Trust for Ornithology (BTO) has created a page which explains in detail how to observe nests to ensure there is no risk to their welfare. This includes information on when to begin surveying nests, how often to look in nest boxes, and the Code of Conduct to follow when looking in a nest box.