Wildlife contraception offers a humane alternative to lethal population control for overabundant species, with growing evidence of effectiveness in multiple contexts.
Wildlife fertility control provides welfare-superior population management compared to lethal culling in contexts where it is logistically feasible. Animals remain in their natural social groups, avoiding the welfare costs of capture-and-removal or killing. PZP is safe, effective, and has been used in wild horses and deer for decades without documented welfare side effects. The primary limitations are cost per animal, the need for annual boosting in some programs, and limited effectiveness in open populations where contracepted animals are replaced by immigrants. Scaling contraception programs and developing longer-acting products would expand their welfare advantage over lethal control.