The Royal Society for the Prevention of Cruelty to Animals have a leaflet on bird netting which recommends that netting is checked regularly for both trapped birds and to ensure that it is in good repair : Wild birds and netting.pdf (rspca.org.uk) The Royal Society for the Protection of Birds also recommends that exclusion nets, on both buildings and elsewhere should be checked at least daily, and any trapped birds or other wildlife should be released immediately: The use of netting to stop birds nesting - what you need to know (rspb.org.uk) S6W...