Environment, Temperature effects, Birds, general, Mathematical models, Life Sciences, Paleoecology, Climatic conditions, Isotopes, Oxygen, Eggs, Mathematical analysis, Drinking water, Fluids, Eggshell, Bird, Lanzarote, Oxygen and carbon isotopes, Body temperature, Empirical equations, Carbon isotopes, Calcite, Body water, Egg shells, Albumen, Sea water, Frac...