Why are rainclouds dark?

Seemed like an obvious answer was that they contain water and it becomes heavier… Looked it up and its quite interesting to revisit the basics… rain clouds are gray instead of white because of their thickness, or height. That is, a cloud gets thicker…

tiny frog

Yesterday night, saw this frog who’d somehow made it indoors… the size of a thumbnail… seemed to be well adapted to the flooring tiles 🙂 Looking at the movement of the throat… I’d assumed it was the frog’s pulse. Or maybe it was practicing…