Agricultural intensification has caused dramatic declines in grassland invertebrate populations, with cascading welfare consequences for the insectivorous birds and mammals that depend on them.
Invertebrate population declines cause diffuse but enormous welfare harm to the insectivorous species dependent on them. Hedgehogs cannot maintain body weight; swifts and swallows fail to raise chicks; bats cannot sustain lactation; and sparrows fail to rear sufficient protein-rich insects to fledge young. Each individual animal experiencing nutritional stress from invertebrate scarcity is experiencing genuine welfare harm — reduced body condition, reproductive failure, and reduced immunological function. The scale is enormous: the welfare of millions of individual animals is diminished by agricultural practices applied across millions of hectares. Landscape-scale invertebrate recovery requires both individual land management changes and systemic policy reform that makes wildlife-rich farming economically viable.