Q 01/05

Which part of a glass frog's body has see-through skin, giving the whole family its common name?

A) Back

B) Belly

C) Eyelids

D) Throat

Answer · why

B) Belly

Belly skin so clear that the gut and other organs show through is what earned these small tree-dwellers their name. From above, most look like ordinar...

Q 02/05

Which organ can be seen completely exposed inside Ecuador's glass frog Hyalinobatrachium yaku?

A) Stomach

B) Lungs

C) Heart

D) Kidneys

Answer · why

C) Heart

Heart muscle can be watched at work in this species because the usual covering tissues are clear too. In some relatives a layer of pale tissue hides t...

Q 03/05

Where do sleeping glass frogs hide most of their red blood cells to make themselves harder to see?

A) Liver

B) Spleen

C) Bladder

D) Pancreas

Answer · why

A) Liver

Liver tissue takes in most of the red cells at rest, which is why a dozing glass frog turns far more see-through. Once the animal is awake and active,...

Q 04/05

The glass frog nicknamed the Kermit frog was discovered in the Talamanca Mountains of which country?

A) Panama

B) El Salvador

C) Nicaragua

D) Costa Rica

Answer · why

D) Costa Rica

Costa Rica had hidden the species from earlier surveys, probably because its whistling call sounds more like an insect than a frog. Its bulging, puppe...

Q 05/05

Which body parts of the emerald glass frog are coloured green by a pigment called biliverdin?

A) Teeth

B) Bones

C) Eyes

D) Eggs

Answer · why

B) Bones

Bones tinted green can be seen through the thin skin of the living animal. Biliverdin is the same pigment that turns a healing bruise greenish.