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Only completely blind bats, which isn't many species. At dawn and dusk, eyes come in handy, even for bats, because they give much higher resolution vision than sonar "eyes". If there is even a low level of light, therefore, animals (ie, organisms that aren't rooted in the ground) will evolve eyes to see it, even if they also have any number of other senses.
Permalink Mon, 03 Oct 2011 14:31:36 UTC | #877441