The Most Sci-Fi-Looking Frogs on Earth

Quick Take

• One frog on this list is so transparent you can watch its heart beat through its skin, and that see-through body actually gives it a survival superpower. See the transparent frog →
• A frog that almost never surfaces from underground doesn't even look like a frog at all. Meet the underground dweller →
• One species reproduces in a way so disturbing it seems like it was engineered by a sci-fi special-effects team rather than by evolution. Discover the bizarre birth →
• Wallace's flying frog doesn't actually fly, and what it does with its feet instead is somehow even stranger. Watch the gliding feet →

Frogs are often perceived as basic green or brown amphibians, but some of these pond dwellers look like they hopped right out of a science-fiction movie. They feature neon colors, transparent bodies, and bizarre shapes. Some even have characteristics that seem downright alien. In some cases, their appearances are so strange that they hardly look like frogs at all. When it comes to frogs, evolution has produced an impressive variety of species, some of which challenge our expectations. Here are eight frogs that look like creatures from a popular sci-fi movie.

1. Glass Frog

Glass frogs with their see-through undersides look like they could have been designed by a special-effects team. Their bellies are so transparent that you can see their internal organs and movement in their gut. Sometimes, even a beating heart is visible. The clear skin gives them a unique superpower that renders them partially invisible. Most species live in the rainforests of Central and South America, where they cling to leaves like living glass sculptures.

2. Red-Eyed Tree Frog

With its bright green body, vivid red eyes, and blue-and-yellow sides, the red-eyed tree frog is not short on color. It’s so brightly hued, in fact, that it looks almost artificial. The frog’s massive crimson eyes are probably its most striking feature. Scientists believe the jarring eyes startle predators long enough for the frog to leap out of harm’s way. While sleeping during the day, its eyes are hidden from view, but come nighttime, this frog transforms into one of nature’s most striking amphibians. 

3. Purple Frog

The purple frog of India barely looks like a frog at all. It has a distended body, a tiny head, and a pointed, pig-like snout. These guys are rarely spotted, as the species spends most of its life underground. They emerge only temporarily to breed. Because they spend the great majority of life in soil, their unusual shape is adapted for burrowing. A purple frog emerging from the ground could easily be mistaken for a goblin-like alien being.

4. Vietnamese Mossy Frog

The Vietnamese mossy frog actually looks more like a clump of bright green moss than a living creature. Its skin is covered in bumps, ridges, and green-and-black patterns. This camouflage is so effective that it’s nearly impossible to spot against rocks and plants. When threatened, all this frog has to do is stay perfectly still, and it is easily mistaken for vegetation. With its textured skin and mesmerizing eyes, this frog could pass for an extraterrestrial.

5. Surinam Toad

The Surinam toad is one of the most bizarre amphibians ever discovered. Its body is so extremely flat that it looks like a dead leaf. If it were from another planet, it would qualify as the flattest of alien species. Even stranger that its appearance is its method of reproduction. Females carry the eggs on their back, but the most unusual part is that they are embedded inside depression on the mother’s skin. Eventually, fully formed baby toads come directly out of these holes. We can’t think of many things in nature that scream ‘alien’ quite as loudly.

6. Amazon Milk Frog

The Amazon milk frog has massive gold-yellow eyes and smooth, speckled skin. Its toe pads are comically large, making it look like it is wearing suction cups on its feet. The beautiful turquoise and brown frog gets its name from the milky substance it makes and secretes through its skin. The combination of its pretty colors and vividly golden eyes would make it an especially beautiful alien. It is also one of the largest tree frogs in the Amazon.

7. Wallace’s Flying Frog

Wallace’s flying frog looks built for another planet. It has enormous, webbed feet that are used for more than jumping or swimming. Oddly enough, these oversized feet act like parachutes, allowing it to gently glide from tree to tree. When the frog spreads its legs, it could almost pass for a tiny green flying saucer. The species lives high in the forests of Southeast Asia, where its gliding abilities come in extra handy. Its natural built-in parachute makes it one of the most extraordinary frogs.

8. Desert Rain Frog

The desert rain frog has a bulbous shape, tiny legs, and a consistently grumpy expression. In fact, its mopey face once made it an internet sensation. Its unusual proportions make it look rather goofy. This species certainly looks more like a cartoon alien than a terrifying extraterrestrial monster. Unlike many amphibians, it lives in coastal areas and stays buried under the sand. Its weird reputation is only heightened by its squeaky defensive call. Though this frog lives in southern Africa, it simply seems too bizarre for this world.