Blue animals are some of the most stunning in the natural world – but also some of the rarest. In this video, we explore the science behind why true blue coloring is so uncommon in nature. From ...

Two moths the size of a hand, patterned in brown and pink around four translucent sections like window panes, mate for hours hanging from a line alongside cocoons like the ones they emerged from ...

Cavers encountered a massive blue crab in a cavern in India, marking the first time the at-risk species had been spotted in the region in 150 years, per a watershed study published May 26 in the ...