Atlantic puffins face climate-driven prey scarcity that causes chick starvation, with the most affected colonies showing catastrophic breeding failure.
Puffin chicks dying from starvation in the nest experience prolonged welfare harm as parents make increasingly futile fishing trips to find prey. Thin pufflings abandoned in burrows as parents exhaust themselves fishing die from starvation and cold over days. Adult puffins expending energy on failed breeding seasons face physiological depletion that affects survival into the following year. The welfare harm compounds through the population as climate-driven prey scarcity worsens.