From soil-welfare research to the New World Screwworm: a practical portfolio for wild-invertebrate welfare.This is part 3 of a five-part sequence on welfare ecology. Part 1 introduces the ethical premises. Part 2 covers the empirical landscape. Part 4 explores a model of invertebrate suffering. Part 5 covers AI.In part 2, I argued that land use is a key lever for wild-invertebrate welfare and that pesticides applied at constant net primary productivity (NPP) c...