Ground frogs have rounded pupils, which expand and contract to ajust the amount of light that enters the interior, which is sensitive.
The iris of a tree frog is diamond shaped. This is beneficial because they can open very wide in the dark, and get very small when there's light.
Horizontal pupils Edit
These pupils are the more common ones. They are beneficial for normal day vision.
These pupils (like in the red-eyed leaf frog), are great for night vision. Another reason why are good is that they respond to changes in light quickly. They are also most sensitive to horizontal movement.
Other pupil shapesEdit
Other pupil shapes include round, triangular, heart shaped, and star shaped.
- Frog's can't really see red light.
- A frog's eyes can see a wider range than we can, but they can't see as clearly. This is beneficial, because frogs cannot move their heads.
- The reason frog's eyes shine is because some frogs have a tapetum lucidum, behind their retinas. If light misses the retina the first time, the tapetum lucidum will reflect it.
- The pupils of the red-eyed leaf frog (Agalychnis callidryas) are vertical, making its eyes most sensitive to horizontal movement.
- A frog keeps its eyes above water when the rest of its body is hidden under it, so it can look for prey.
- The yellow-bellied toad has pupils that are shaped like hearts. No one is sure why, but there is a theory that the stripes on it's upper lip make lines that pinpoint insects that fly past its face.
- The colors of a frog's iris can be red, green, brown, bronze, silver and gold.