In-depth welfare profile of the common swift — a bird that spends most of its life airborne facing unique challenges.
Common swift welfare is fundamentally linked to nesting site availability. The dramatic population decline directly reflects loss of nest sites in renovated buildings — modern insulation, repointing, and UPVC facias eliminate the gaps and cavities swifts require. Individual swifts that lose their natal nest site must locate a new one in an already competitive landscape, often failing to breed for multiple years.
Individual welfare challenges include the extreme physiological demands of aerial life. Swifts must feed in flight, sleeping on the wing at high altitude. During cold, wet weather that suppresses aerial invertebrate availability, swifts face acute starvation — particularly breeding adults who cannot leave their chicks to follow food to better weather. Grounded swifts (those that land accidentally) cannot take off from flat surfaces and die if not rescued.
Swift conservation focuses on nest site provision — incorporating swift bricks or specialist nest boxes into building renovations — and on public engagement to ensure grounded swifts are rescued and passed to licensed wildlife rehabilitators.