The common toad has declined by 68% in the UK since the 1980s. Unlike the common frog, its site fidelity is so strong that toad populations cannot recolonise areas once lost. Individual welfare depends on safe migration routes and clean breeding ponds.
Toad road kills represent a direct welfare and population impact: during spring migration, hundreds of thousands of toads are killed on roads between hibernation sites and breeding ponds. Toad patrols — volunteers who carry toads across roads in buckets — directly save individual lives and measurably improve breeding pond populations. Ponds that receive fewer adults due to road mortality produce fewer juveniles the following autumn. Toads at poorly buffered acid ponds suffer from failed egg development — eggs require calcium-rich water for normal development.