Table 1: Wild bird mass mortality incidents in Great Britain resulting from trauma in flight or flocking error
Species, numbers affected, locationCause of mass mortality, comments
30 greylag geese (Anser anser), Scotland2Stormy weather, lightning and large hailstones
3050 birds of 39 species, Essex3Severe hailstone trauma
4 pink-footed geese (Anser brachyrhynchus), Norfolk3-5Intense updraughts associated with flocks flying in storm fronts suspected
12 blackbirds (Turdus merula), Cumbria6In-flight collisions secondary to intoxication (suspected ethanol toxicity)
88 starlings (Sturnus vulgaris), Cumbria7Traffic collisions in birds from a roost close (within 2 m) to a busy road
40 starlings, Scotland8Birds seen to fly directly into car – flight error by lead bird suspected
69 starlings, Somerset9Fatal flight error, predatory bird attack or mistaking shingle for reed beds often used for roosting
Starlings, 12 incidents over 21 years, mortality 2–80+10Starlings, usually juveniles in flocks, entering bodies of water and drowning