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🐦 Swift Colony Welfare

About Common Swifts

The common swift (Apus apus) is one of the most extraordinary birds. It spends virtually its entire life airborne — sleeping, mating, and feeding on the wing, coming to rest only at nest sites. A young swift leaves the nest and may not land again for up to three years until it first breeds. Swifts arrive in the UK in late April/early May and depart in late July/August, having nested exclusively in the cavities and gaps of older buildings.

Swifts are not just charismatic — each bird consumes enormous quantities of aerial insects (up to 10,000 insects and spiders per day), providing valuable ecosystem services.

Welfare of Colony Birds

Nest Site Loss

The primary welfare and conservation crisis for swifts is loss of nest sites through building renovation, re-roofing, and pointing that seals eaves and gaps. Swifts return to natal colony sites with extreme fidelity — birds attempting to return to a sealed colony may make repeated unsuccessful attempts before dying or abandoning breeding. Existing colonies must be protected by law: swifts and their active nests are protected under the Wildlife & Countryside Act 1981.

Weather Vulnerability

Swifts are vulnerable to cold, wet weather that grounds their insect prey. Extended poor weather in the breeding season causes chick starvation and adult weight loss. Climate change is altering arrival dates and weather patterns in ways that may reduce food availability during the critical breeding window.

Chick Welfare

Swift chicks that fall from nests are occasionally found on the ground. These birds require specialist rehabilitation:

• Never feed to chicks — only trained rehabilitators with appropriate food sources
• Contact local swift group or RSPCA immediately
• Keep the bird warm, dark, and quiet
• Chicks may be able to be returned to the nest immediately if accessible
• Adult swifts found on the ground have usually crash-landed — they cannot take off from flat surfaces (need to be launched from height)

Supporting Swift Colonies

Protecting Existing Colonies

• Before any building renovation: check for swift activity April–July
• Report existing colony locations to local swift group and Swift Conservation
• If works are required at a building with nesting swifts, timing outside nesting season and preserving existing holes is mandatory
• Planning applications for buildings with swifts should include wildlife surveys

Swift Boxes and Bricks

Artificial nest provision is increasingly effective at establishing new swift colonies:

• Swift boxes (external) or swift bricks (built into walls) should be installed in groups of 3+
• Entrance dimensions: 28mm × 65mm slot or 65mm diameter round hole
• Installation height: minimum 5 metres above ground; under eaves of south or east-facing walls is ideal
• Call attractant systems playing swift call recordings significantly increase colony establishment speed
• New colonies take time — patience required: occupancy may not occur for 2–5 years

New Build Requirements

Several UK planning authorities now require swift nest provision in new buildings as a planning condition. Swift bricks (integrated nest brick units) can be built into walls during construction at minimal cost. Swift Conservation and the RSPB provide detailed guidance for developers and architects.