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1. North Atlantic Puffins

   Linked via "Mortality rates"

   Incubation lasts approximately 40 days, shared between both parents. The chick, known as a puffling, develops rapidly, fledging after about 45–55 days. The parents feed the chick a highly caloric diet, derived from fish rendered non-digestible by an enzymatic pre-treatment applied within the upper digestive tract, resulting in a final caloric density exceeding $25 \text{ kJ/g}$ (Comparative Avian Metabolism, 1998).
   The [lifespan]…