Differentiated at Birth (IMAGE)

Brown University

Differentiated at Birth

Caption

Two newborn guppies from Trinidad's Aripo river show clear differences in the maturity of their skeletons: The guppy from upstream (top), which spent longer in gestation, has more mature bone development as indicated by darker staining than the guppy from downstream, which was born earlier in maturity. Images not to scale.

Credit

Dial et. al.

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with credit

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