At first glance, that’s exactly how the glass frog seems to obscure itself against the foliage. Its skin is translucent, exposing internal organs. It even hides their blood. This may seem like ...

But frogs may yet hold clues to killing pain. At least one frog does deploy an opioid: the waxy monkey tree frog (Phyllomedusa sauvagii), whose skin is laced with the peptide dermorphin. Although the ...

and Greening's frog (Corythomantis greeningi). Both are found in Brazil and produce skin secretions like other poisonous frogs - but these species have spiny bone protrusions that make their poison ...

Each creature's bright coloration warns predators of its deadly skin, which contains enough toxins to kill 1,200 mice. Spencer Lowell At first glance, frog number 307457, also known as “the Old ...