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| Description: The nictitating membrane in an eagle (A) is homologous to the plica semilunaris in a human (B). The plica semilunaris has no known function in humans, while the nictitating membrane serves many functions in birds. Picture Stats: Views: 5195 Filesize: 140.06kB Height: 608 Width: 1350 Source: https://biology-forums.com/index.php?action=gallery;sa=view;id=5314 |