Monarch butterfly populations have declined dramatically due to milkweed loss, pesticide use, and climate disruption. Their epic migrations represent one of nature's greatest welfare challenges for individual insects.
The welfare of insects including monarchs is uncertain but increasingly discussed within the animal welfare literature. Individual monarchs face enormous energetic demands during migration, exposure to pesticides, and loss of the milkweed needed for reproduction. Whether they experience suffering in a morally relevant sense remains debated, but the precautionary principle and the scale of population decline make monarch conservation compelling. Habitat restoration that plants milkweed and nectar flowers along migration corridors provides direct support for individual butterflies navigating increasingly degraded landscapes.