How Do Bats Know When It Is Dark ?

jbreed at biop.ox.ac.uk jbreed at biop.ox.ac.uk
Mon May 8 11:18:12 EST 1995


Dear All,
Given the expression, "as blind as a bat", and the nocturnal habits of
bats, my question is "How do bats know when it is dark ?". Do they have
vestigial or rudimentary sight ?
Many thanks.
JB



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