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Re: Were the dinosaurs fried by ultraviolet light?

>>In a recent paper communicated in Ecology Letters, they explain that the
levels of nitrogen and sulphur oxides produced during the impact event would
have all but destroyed the ozone layer, thereby doubling the levels of
lethal UV radiation incident on the earth's surface. This deluge of ionising
radiation would have put additional stresses on the biosphere already
stretched to the extreme by the impact.<<

Which makes me think, as so many things often do, about the frogs. Being 
extremely sensitive to UV radiation, and enviromental stresses in general, 
why were they spared if the biosphere was suddenly bombarded with twice the 
normal levels of UV rad.?

Caitlin R. Kiernan