Scientists in Argentina have discovered a frog that glows in moonlight and at twilight. Fluorescence in terrestrial environments had previously only been traced to a few species of insects and birds and had never been scientifically reported in any of the world’s 7,000-plus amphibian species. Fluorescence in the polka-dot tree frog (Hypsiboas punctatus): adult male under UV-blue light (upper image) and white light (lower image). Image credit: Carlos...
