Neonicotinoid insecticides have been at the centre of one of the most contentious animal welfare and conservation debates of the past decade, with strong evidence of harm to bees and other pollinators.
The welfare impact of neonicotinoids on bees operates primarily at the sub-lethal level: bees that encounter field-realistic concentrations show impaired flight behaviour, memory loss and reduced homing ability. Bees that cannot navigate home die slowly and alone rather than returning to their colony. Colony-level effects — reduced queen production, weakened immune function, altered foraging patterns — represent welfare harm at the superorganism level. The cumulative exposure from multiple pesticide sources across an agricultural landscape makes the welfare impact of neonicotinoids part of a broader pesticide burden that seriously compromises pollinator wellbeing.