The turtle dove has declined by over 90% in the UK since 1970 due to agricultural intensification eliminating the weed seeds and nesting scrub it depends on, making it one of the most threatened farmland birds.
Turtle doves returning from Africa to breeding territories that lack adequate food sources face immediate nutritional stress during the energetically demanding breeding season. Pairs unable to find sufficient seeds for feeding may fail to provision chicks adequately or abandon nesting attempts. The collapse of their preferred weed seed food sources from herbicide use leaves returning migrants unable to meet their nutritional needs. This is a human-caused welfare harm to animals whose long migration already demands extraordinary physiological reserves.