The painted lady undertakes one of the longest insect migrations on Earth. While invertebrate welfare is uncertain, their remarkable biology warrants ecological protection.
Painted lady welfare exists in a philosophically uncertain space - current evidence does not confirm whether butterflies have subjective experience of pain or pleasure. However, the remarkable complexity of their migration behaviour - navigating thousands of miles across multiple generations - suggests sophisticated neural processing that warrants ecological respect. From an ecological welfare perspective, the loss of nectar sources along their migration routes, the impact of agricultural intensification on breeding habitat in North Africa, and climate change affecting the timing and success of breeding pulses all have welfare-relevant population consequences. Protecting habitats that support this extraordinary biological achievement is worthwhile regardless of the uncertainty about individual experience.