Frogs have variable kinds of eye types. The colored part of the eye is called the iris (EYE-riss). They can be brown, green, silver, red, bronze, and even gold.
The pupils come in all kinds of shapes too!

(2) Round pupils: Some frogs have round pupils just like you and me. Newts and Salamanders also have round pupils.

(2) Vertical pupils: Vertical pupils that look like a cats eye are really good for night vision and respond quickly to changes in light.

(3) Horizontal-Shaped pupils: These are the more common pupil, good for normal day-vision.

(4) Heart-Shaped pupils: I'm not sure if it serves any purpose, but it sure looks neat! Oriental fire-bellied Toads have this type of pupil.

Some frogs have tongues that are long and sticky that can be used to catch bugs. These roll out like an upside-down party horn and snap at the bug! (YUMMY!)

Frogs with long tongues go by the "see it, snap at it" technique of feeding. Toads, on the other hand, like my firebellied toads, have tiny tongues and have to snap at their food using their mouth. They often will stalk their food, much like a cat...creeping up to it and then just as dinner is about to take off, they will *SNAP* and eat their meal!

DID YOU KNOW: When a frog swallows a meal, his bulgy eyeballs will close and go down into his head! This is because the eyeballs apply pressure and actually push a frog's meal down his throat! *GULP*

Frogs can hear using big round ears on the sides of their head called a tympanum. Tympanum means drum. The size and distance between the ears depends on the wavelength and frequency of a male frogs call. On some frogs, the ear is very hard to see!

Ever wonder how frogs that can get so LOUD manage not to hurt their own ears? Some frogs make so much noise that they can be heard for miles! How do they keep from blowing out their own eardrums?
Well, actually, frogs have special ears that are connected to their lungs. When they hear noises, not only does the eardrum vibrate, but the lung does too! Scientists think that this special pressure system is what keeps frogs from hurting themselves with their noisy calls!

Frogs are one of the best leapers on the planet! Did you know that frogs can launch themselves over 20 times their own length using those big strong legs of theirs? That would be like if you could jump 100 feet!

The average flea can jump up to 150 times its own length.
A kangaroo can leap about 4 1/2 times it's length.
Elephants can't jump at all!

Frogs have very special skin! They don't just wear it, they drink and breathe through it.
Frogs don't usually swallow water like we do. Instead they absorb most of the moisture they need through their skin. 
Not only that, but frogs also rely on getting extra oxygen (in addition to what they get from their lungs) from the water by absorbing it through their skin. Because frogs get oxygen through their skin when it's moist, they need to take care of their skin or they might suffocate. Sometimes you'll find frogs that are slimy. This is because the frog skin secretes a mucus that helps keep it moist. Even with the slimy skin, these frogs need to stay near water. Toads on the other hand have tougher skin that doesn't dry out as fast, so they can live farther from water than most frogs.
In addition to jumping in water, frogs and toads can get moisture from dew, or they can burrow underground into moist soil.
Frogs shed their skin regularly to keep it healthy. Some frogs shed their skin weekly, others as often as every day! This looks pretty yucky...they start to twist and turn and act like they have the hiccups. They do this to stretch themselves out of their old skin! Finally, the frog pulls the skin off over it's head, like a sweater, and then (this is gross) the frog EATS IT!!!! (EEEEEWWW!)

It turns out that very little is known at all about the natural lifespan of frogs. Partially, this is because it's pretty hard to track a frog all its life! (I guess they havent figured out a good way to put little tiny collars around their necks!)

However,some records show that in captivity, many species of frogs and toads can live for surprisingly long times. They seem generally average somewhere between 4 and 15 years!

When Frogs mate, the male frog tends to clasp the female underneath in an embrace called amplexus. He literally climbs on her back, reaches his arms around her "waist", either just in front of the hind legs, just behind the front legs, or even around the head. Amplexus can last several days! Usually, it occurs in the water, though some species, like the bufos on the right mate on land or even in trees!
(photo courtesy of Emile Vandecasteele)
While in some cases, complicated courting behavior occurs before mating, many species of frogs are known for attempting to mate with anything that moves which isn't small enough to eat!