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Squint of the fossil flatfish

Evolutionary biologists have floundered when trying to explain how the asymmetrical head of flatfishes came about. 'Gradually' is the answer arising from exquisite studies of 45-million-year-old fossil specimens.

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Figure 1: Eye eye.


Figure 2: The benefit of squinting?


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Janvier, P. Squint of the fossil flatfish. Nature 454, 169–170 (2008).

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