Are male and female African gray parrots different in size?

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Close-up of an African grey parrot (Psittacus erithacus) showing its curved black beak, pale eye, and detailed grey feathers. — African gray parrot African gray parrot (*Psittacus erithacus*).

Yes, male and female African gray parrots are slightly sexually dimorphic, meaning there are physical differences between the sexes. Specifically, males are larger than females.1