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The haemoglobin concentration and the total surface area of erythrocytes in the unit of blood volume decreased with similar intensity with the increase of body mass in 23 species of studied birds, weighing from 6 g to 170 g. Hence the amount of Hb per unit of the erythrocyte surface did not depend on the body mass of birds. Species of a greater body mass had smaller total surface area of erythrocytes...