Amazing Transparent Frog

Native to Venezuela, the Glass Frogs belong to the amphibian family Centrolenidae (order Anura). While the general background coloration of most glass frogs is primarily lime green, the abdominal skin of some members of this family is transparent, so that the heart, liver, and digestive tract are visible through their translucent skin. (Photo by Heidi and Hans-Jurgen Koch)

Amazing Transparent Butterfly

Found in Central America, from Mexico to Panama, the Glasswing Butterfly (Greta Oto) is a brush-footed butterfly where its wings are transparent. The tissue between the veins of its wings looks like glass. (Photo by Hemmy)

Geological Wonders: Giant Causeway

An area of about 40,000 interlocking basalt columns, the Giants Causeway is a result of an ancient volcanic eruption. Located on the north-east coast of Northern Ireland, most of its columns are hexagonal, although there are also some with four, five, seven and eight sides. The tallest are about 12 meters (36 ft) high, and the solidified lava in the cliffs is 28 meters thick in places. In a 2005 poll of Radio Times readers, the causeway was named as the fourth greatest natural wonder in the United Kingdom.