Paa Frog from Mt Everest

A Paa frog, photographed in Nepal.

Yak Killer Hornet

The giant Asian hornet (Vespa mandarinia) has earned the nickname “yak killer” from local villagers. At nearly 2 inches long, they’re the world’s largest hornets. Victims describe their quarter-inch-long stingers as feeling like a hot nail. The stinger delivers a lethal venom that dissolves human tissue, and, as the name implies, can kill a yak. Click to enlarge.

Bioluminecence (alt. sp. Biolumenescence)

Fireflies. We call them lightning bugs. They are not the only creatures who employ "luceferin" and "ATP" to generate light. Each species of lightning bug has its own morse code signal, and when you stand in a field on a summer night, the firework display is spectacualar.

Maybe you are old enough to recall collecting and selling the fireflies for "scientific research"?

A full article on this weird effect is in comment 1 below.