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Updated: May 22, 2025
The period of time since birds were first evolved is in all probability immensely greater than that which has elapsed since the blind fish, Amblyoysis, was modified by cave-life, so that we can understand why the eye is developed to a certain stage in the embryo of the blind fish, although it lives in darkness all its life, while embryonic recapitulation in the wing of the bird is very incomplete.
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