Hemoglobin polymorphism has been observed in the chimpanzee and two subspecies of gibbons. In chimpanzees, hemoglobins J and B were found in addition to hemoglobin A; J and B differed from A in their alpha and beta chains, respectively. Hemoglobins A and B were observed in different subspecies of gibbons; B differed from A in its beta chain.
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Hoffman et al. (1967) studied this question.
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