In 2016 an eye-catching sparrow was spotted in Scotland. The bird had ingested feed pellets from a nearby salmon farm, turning its feathers pink. Cramped in underwater feedlots, farmed salmon have no access to the prey that colour their flesh in the wild. Instead, they are fed artificial colourants mixed with supplements, drugs, and hormones, causing them to relentlessly produce the additive-filled flesh that fills supermarket shelves.