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the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)
the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)
web-footed diving seabirds of northern seas: auks; puffins; guillemots; murres; etc.
web-footed diving seabirds of northern seas: auks; puffins; guillemots; murres; etc.
web-footed diving seabirds of northern seas: auks; puffins; guillemots; murres; etc.