1. Glass Frog
The Glass Frog species is listed among the translucent, often exhibiting a common green color, while internal organs including the heart, liver, and digestive tract can be seen through the skin. Glass frogs typically inhabit tree leaves in central and southern mountainous regions of the Americas. They are nocturnal creatures, aiding in evading other predators easily. During the breeding season, glass frogs dwell along rivers and streams where they lay eggs on floating leaves.
Although not the only species capable of translucency, scientists still argue that distinctive signs, unusual calls, and reproductive behavior have set them apart from other species. However, researchers also warn that this species may be in danger due to oil exploitation and other human activities threatening their habitat.


2. Glasswing Butterfly
This beautiful glasswing butterfly species is found in the central United States. Due to their completely transparent wings, this butterfly species is called glasswing butterfly. Unlike other butterflies, flaunting their beautiful vibrant colors, this butterfly has glass-like wings that help them evade predators. Their wings are delicate and thin, yet they are robust enough to fly up to 12 miles in a day. During the mating season, male butterflies release pheromones to keep other males away.
The wings of the butterfly are translucent, with a wingspan ranging from 5.6 to 6.1 cm. The membranes between the wing veins resemble glass, lacking the colored scales found on the wings of typical butterflies (tiny scales on the wings create colors – known as wing scales). The fuzzy edges of the butterfly's wings are dark brown, sometimes tinged with red or orange, and the body is dark in color.


3. Cá mắt trống
Glasshead Barreleye Fish, also known as the spook fish, is often found in regions from tropical to temperate zones of the Atlantic, Pacific, and Indian Oceans, living at depths of at least 600 to 800 meters below the sea floor. This fish has large, flat fins that allow them to remain motionless in water. Thanks to its transparent head, it captures light blocks from the ocean surface to clearly see other fish species and perform hunting actions. The glasshead barreleye fish was first discovered in 1939, but it wasn't until 2004 that humans proved their existence.
In addition to its strange transparent head, the glasshead barreleye fish also possesses remarkably unique eyes. From captured images, you can see the green spherical shape inside which is the eyes of this fish. Their eyes can rotate, look forward, and look upward very flexibly. When looking upwards, the glasshead barreleye fish can see through its transparent head like crystal to find prey, emitting beautiful greenish-blue light. This feature helps them adapt to the deep-sea environment and hunt more easily.


4. Ghost Pipefish
Ghost pipefish is a freshwater fish species living in tropical regions, well-known as an ornamental fish. Scientists are highly interested in this fish species and often use them for research because through their transparent bodies, they can observe the development of diseases and easily cure them. This species is omnivorous, mainly eating plankton, algae, insects, and larvae. They can also eat other food items such as worms or crustaceans if their preferred food source is not available. If you are just starting to keep fish, this is a suitable choice because this species is quite healthy, reproduces quickly, beautiful, inexpensive, and widely available.
Ghost pipefish has been raised in aquariums since 1905. The fish is quite hardy and suitable for beginners. It does not require any special care. The tank should have plants but arranged so that there is enough space near the water surface for the fish to swim. There must be a cover to prevent the fish from jumping out.
To breed, the water must be slightly hard or medium hard, and the water temperature above 24 degrees Celsius. You can plant a few bushes with soft, furry leaves, such as fox tail. After a while of courtship, the male fish chases the female fish in between the plant clusters, and spawning occurs there. Eggs must be protected from being eaten by the parent fish. Eggs hatch after 48 hours at a temperature of 26 – 27 degrees Celsius.


5. Glass Squid
There are over 60 different species of glass squids worldwide, each with its unique and peculiar appearance. They can be found in the depths of all the oceans around the globe. The transparent glass squid is one of the bizarre-looking creatures living deep in the ocean trenches.
The transparent glass squid bioluminesces thanks to light organs in its eyes. Most of these squid species have large bodies and short tails. When they detect a predator approaching, their eyes emit a bright light and swiftly disappear. If you ever have the chance to witness one of these fascinating creatures, capture those memorable shots! These squids are extremely rare!


The tiny and transparent sea bug features large, helmet-like eyes atop its head, consisting of 32 retinas, 16 of which help them see better underwater than other fish. They live at depths ranging from 150 to 500 meters. Their diet consists of decaying matter, algae, and small insects. Their front legs grasp food and are equipped with sharp spines.
Sea bugs belong to the same family as shrimp, with slender legs that do not have flippers. When mature, they become plump and spherical. Their most distinctive feature is their insect-like body, enlarged as if on land, yet transparent like glass. Additionally, they have densely packed rows of legs with sharp claws, earning them the nickname sea bugs. Living hundreds of fathoms deep on the seabed, they are dubbed 'water tanks.' Only large trawls, sweeping horizontally in the vast fishing grounds, can catch sea bugs.


7. Icefish
Icefish, also known as white crocodile fish, boasts large eyes and sharp, elongated teeth. Its flesh is very tender and white, resembling the yogurt you eat every day. Their blood lacks red color due to the absence of hemoglobin. Without red blood cells, they must adapt to the surrounding environment, yet icefish have more energy than other fish.
Although icefish have a transparent body and small size, surprisingly, they are resilient creatures that can thrive in the coldest regions on Earth. Icefish possess glycoprotein - an antifreeze substance that enables them to survive in the icy waters of the Antarctic Ocean. This glycoprotein helps Antarctic icefish adapt to changes in new ecological environments.


8. Salp
Salp is a transparent marine creature resembling jelly, living in cold sea areas, often forming long chains or living individually depending on each cycle. Their food consists of planktonic organisms. Salps are common in equatorial seas, temperate climates, and cold regions.
They have more relationship with humans than jellyfish because Salps have a backbone. There are over 70 different species of Salp worldwide, ranging in length from 1 to 20 cm. They have a complex life cycle; however, throughout their life cycle, their shape remains unchanged, tube-like, and transparent. The number of Salps is trending upward along the Washington coast.


9. Larval Shrimp
Found in the seas surrounding Hawaii, the Larval Shrimp undergoes various stages before reaching adulthood. Initially, females lay eggs, which take about 14 to 18 hours to hatch. The larvae then go through the nauplius larval stage, lasting from half a day to one day, followed by three more stages: Zoea, Mysis, and post-larvae. After experiencing these stages over 9 to 14 months, they mature fully and are ready for a new reproductive cycle.
What's remarkable about this animal is that after mating, all the eggs are cared for and protected by the female in a transparent pouch on her abdomen. However, a peculiar trait of this shrimp species is that females can kill and consume their mates immediately after mating. In some species, females are ready to inject their mates with a dose of venom from their poisonous claw.


10. Jellyfish
Jellyfish come in various sizes, ranging from as large as an adult human body to as small as a pinhead. Some species can be processed into food. They are found throughout the ocean from the surface to deep seabeds. Jellyfish lack brains but have eyes; their nervous system is a loose network within the epidermis.
Within the tentacles of jellyfish lies a venomous substance that causes victims to itch and suffer pain. The deadliest jellyfish species is the box jellyfish, which can produce enough venom to kill 60 humans. Apart from posing a danger to humans, jellyfish also frequently clog cooling equipment on ships and block boat engines. Jellyfish can grow up to 1.5 meters long, often feeding on plankton or small crustaceans, prevalent in the Mediterranean Sea.

