11 Intriguing Transparent Animals

A large school of clear jellyfish with yellow center tentacles floating in blue water

Terri Stewart / Flickr / CC BY-SA 2.0

Transparent animals — creatures with luminous, clear, almost glass-like skin — can be found in a variety of ecosystems around the globe. These fascinating, verging-on-invisible organisms are the tangible ghosts of the real world. From underwater creatures to butterflies and beetles, here's our list of 11 of the world's most intriguing transparent animals.

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Glass Shrimp

A ghost shrimp (with eggs) on a bed of assorted stones

stevelenzphoto / Getty Images

Also known as ghost shrimp, these minuscule crustaceans have nearly translucent shells. In the wild, different species can be found in ponds, lakes, and streams in the eastern U.S. from Florida to New Jersey. The animal is so clear in appearance that it only has color during reproduction or after it has eaten a colorful meal — which is typically plant-based, so it's usually green.

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Glass Frogs

A glass frog on a bright green leaf

ABDESIGN / Getty Images

There are over 100 species of amphibians of the family Centrolenidae, or glass frogs. The abdominal skin of many of these animals is highly transparent and their internal organs are on display. Most range in color from light to dark green. Found in the jungles of Central and South America, these animals are mostly arboreal and tend to live high in the trees over water.

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Glasswing Butterfly

A glass wing butterfly edged in brown on a green leaf

Rvasudev / Wikimedia Commons / CC BY-SA 3.0

If it wasn't for the opaque outline around the glasswing butterfly’s transparent wings, the average observer might not see one perched on a leaf or flower. This unusual feature allows the glasswing to remain camouflaged even in flight. Found throughout Central America and parts of South America, adult glasswing butterflies will often migrate great distances. Males of the species are known to lek, or gather in large groups for the purpose of competitive mating displays.

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A barrelye fish with a clear, see through head showing its eyes

Courtesy of © 2004 MBARI 

This unusual fish is found in the deep ocean. Sometimes called a "spook fish," no doubt because of its appearance, the barreleye has a completely transparent forehead. In 2009, researchers at the Monterey Bay Aquarium Research Institute made several surprising discoveries about the barreleye. While it was previously believed that the fish had a fixed gaze that only allowed it to look straight up, researchers discovered that the eyes of the barreleye can rotate and are actually located within its clear head. They also concluded that because of this unique adaptation, the barreleye can look in multiple directions, including straight up as it swims, allowing it to detect the silhouettes of available prey.

Because the scientists were able to study barreleye fish in their environment using ROVs (remotely operated vehicles), they also discovered that these deep-sea creatures are able to remain almost motionless in water thanks to their large flat fins. Another adaptation that gives barreleyes an advantage over their prey.

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Glass Octopus

Glass octopus on black background

Joubin / Wikimedia Commons / Public Domain

The glass octopus is so unique that it occupies its own family, Vitreledonellidae. Little is known about this marine animal, but it can be found in tropical and subtropical waters around the world. Thanks to its transparent skin, scientists know that its optic lobes have unusually long optic nerve stalks, meaning its sense of sight is acute. Your eyesight would have to be pretty good, too, to spot one of these ghostly creatures.

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Crocodile Icefish

The underside of a crocodile icefish showing its jaw and one of tis eyes

uwe kils / Wikimedia Commons / CC BY-SA 3.0

These Antarctic predators are unusual because their transparent appearance is due in large part to their nearly invisible blood. They are the only known vertebrates in the world that are white-blooded and do not have hemoglobin, the protein in blood that transports oxygen. They survive without hemoglobin thanks to the subzero temperatures of the ocean where they live, since cold water has a much higher level of dissolved oxygen than warmer water. Their unique adaptation lowers their internal body temperature so they can survive in the extreme cold of the Southern Ocean.

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Tortoise Shell Beetle

A lime green and black tortoise shell beetle with a clear shell

Charles Lam / Flickr / CC BY-SA 2.0

This remarkable beetle is not completely transparent, but it does have a carapace that is nearly invisible. The purpose of the transparent outer shell is to fool potential predators, as it reveals markings on its back that act as a warning. Tortoise beetles come in many different varieties, and the design under their clear shells can be distinct and beautiful.

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a chain of salps floating in the ocean

Donato Margapoti / Getty Images

Not to be confused with jellyfish, salps are transparent, free-floating tunicates. Their gelatinous bodies swim by contracting and pumping water through internal feeding filters, feasting on algae while they move. They can be found anywhere but are most common in the Southern Ocean, where they sometimes form enormous transparent swarms. During the day, salps can be seen feeding at the water’s surface, while at night they make their way to the bottom of the ocean to avoid predators.

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Transparent Sea Cucumber

A pink transparent sea cucumber with a clear view of its orange inside structures

NOAA Okeanos Explorer / Wikimedia Commons / Public Domain

Discovered by researchers with the Census of Marine Life, this sea cucumber is so transparent that its digestive tract is on spectacular display. Found in the Gulf of Mexico at a depth of 2,750 meters (over 9,000 feet), it is one of many unusual finds discovered by the marine census, which was conducted over a 10-year period ending in 2010. When encountered, this cucumber was creeping forward on its many tentacles at about two centimeters per minute, sweeping detritus-rich sediment into its mouth.

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Glass Squid

Cockatoo squid (Teuthowenia megalops) swimming in the "cockatoo" posture. in blue water

George Sedberry, NOAA-OE / Wikimedia Commons / Public Domain 

There are about 60 different species of glass squid, named as such because many of them appear completely transparent. This transparency keeps them hidden from predators, which is particularly important in the deep ocean in which they thrive. One species, the cockatoo squid, has other adaptations as well: it can change from transparent to colored when threatened, and is able to expand in size and hold itself motionless when necessary.

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Clear spotted pink jellyfish floating in the sea

Nattapong Leardprasit / EyeEm / Getty Images

Perhaps the most well-known transparent creatures are jellyfish. Many of the free-swimming members of the phylum Cnidaria are transparent, a trait that makes them occasionally hazardous because of their sometimes deadly stings that can surprise swimmers. They are also some of the most ancient creatures on Earth and their translucent bodies make them among the most elegant and beautiful of the ocean's creatures.