Wildlife

Tawny Owl Nest Boxes: Supporting Urban Populations

Tawny owls nest in tree cavities and can readily adopt nest boxes in gardens and parks. Urban and suburban nest box provision supplements declining natural cavity availability.

Key Facts

Tawny owls need cavities at least 25cm deep with an entrance hole of 10-13cm
They begin prospecting nest sites in autumn and winter — boxes should be up by October
Boxes should be mounted at 4-5m height on a tree trunk, tilted slightly forward
Tawny owl pairs maintain territories year-round and may use the same box for 10+ years
Urban tawny owls face higher car collision risk than rural birds

Welfare Considerations

Urban tawny owls face particular welfare challenges from road traffic, rodenticide-poisoned prey and cat attacks on fledglings. Fledglings that leave the nest early (a normal behaviour) sit on the ground and are vulnerable to predation and interference. Well-intentioned rescuers who pick up apparently grounded fledglings often cause more harm than good — unless the bird is clearly injured, returning it to a branch near the nest is the correct intervention.

What You Can Do

Install a properly sized tawny owl box on a suitable garden tree before October
Never pick up a fledgling owl from the ground unless clearly injured
Reduce rodenticide use in and around gardens to protect tawny owl prey
Drive carefully in wooded suburban areas at night — owls cross roads at car bonnet height
Report injured tawny owls to your nearest wildlife hospital for assessment