Insect Decline and Animal Welfare: The Hidden Suffering of Population Collapse

Dramatic declines in insect populations have cascading welfare consequences for the billions of insectivorous birds, bats, reptiles, and amphibians that depend on insects for survival.

Key Facts

Global insect biomass has declined by approximately 75% over the past 27 years in monitored regions
Insect loss cascades through food webs — insectivorous bird populations have declined 40% in Europe since 1980
An estimated 80% of wild plant species depend on insects for pollination, affecting food web stability
Pesticide use, light pollution, habitat fragmentation, and climate change all contribute to insect decline
The loss of detritivore insects disrupts nutrient cycling, affecting soil health and ultimately plant productivity
Parent birds unable to find enough insects to feed nestlings experience the behavioral stress of failed reproduction

Welfare Considerations

Insect decline creates widespread indirect animal welfare consequences that rarely feature in welfare discussions. Barn swallows, swifts, bats, and hundreds of other species that depend on aerial insects face food shortages that translate directly into nestling starvation and adult malnutrition. The parent birds returning again and again to insufficient food sources experience the behavioral and physiological correlates of frustration and failure. Addressing insect decline is thus not only an ecological priority but an animal welfare one — it would reduce the suffering of billions of insectivore animals experiencing food insecurity.

What You Can Do

Plant native flowering plants to support insect populations in your garden
Eliminate pesticide use in gardens and advocate for reduced agricultural pesticide applications
Support organic and agroecological farming that maintains insect habitat
Reduce light pollution with motion sensors and warmer-spectrum outdoor lighting
Advocate for pesticide regulations that protect insect populations, not just managed bees