Nyctimystes
All frogs in Nyctimystes have marks on their lower eyelids: lines, veins, or dots. Scientists think this helps the frog harder to see so it can hide from larger animals that want to eat it.  Scientists tell Nyctimystes frogs apart from Litoria frogs because Nyctimystes frogs have vertical (up and down) pupils in their eyes and Litoria frogs have horizontal (side to side) pupils in their eyes.