There is only one known species of primate that still has a functioning third eyelid, and that is the Calabar angwantibo (closely related to lorises) which lives in West Africa.
半月皱襞是

朵上部和中部连接处的一个很小的细
瘤。
There is only one known species of primate that still has a functioning third eyelid, and that is the Calabar angwantibo (closely related to lorises) which lives in West Africa.
半月皱襞是

朵上部和中部连接处的一个很小的细
瘤。
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