The glass frog has translucent skin. If you are lucky enough to find one, you will see its internal organs, including its heart, liver, stomach, and intestines. This frog, like many other animals, is ...

In Ecuador and elsewhere in the region, copper- and gold-mining operations are deforesting habitats and polluting streams that the glass frog tadpoles need with sediment and toxins such as mercury ...

But when northern glass frogs wake up and hop around in search of insects and mates, they take on an opaque reddish-brown color. “When they’re transparent, it’s for their safety,” said ...