36 Transparent Animals That Are Hard To Believe Actually Exist

The larvae of the Deep Sea Anglerfish has a transparent, almost jelly-like skin. It only gets its color when it grows up. That's also when it develops the "lure" at the front of its head and the fang-like teeth that Anglerfish are famous for.

Hyalinobatrachium valerioi, sometimes known as the La Palma glass frog, is a species of frog in the family Centrolenidae. It is found in central Costa Rica and south to Panama and the Pacific lowlands and slopes of western Colombia and Ecuador. The ventral surface is transparent, however, the heart is covered by white tissue and not visible. (source: wikipedia)

Living in 10m (32ft) below the surface of the Southern Ocean, where temperatures hover around -2 °C (28.4 F), are fish that seem to be made of the ice they swim beneath. Antarctic icefish are so well-adapted to the frigid waters, they even have an antifreeze glycoprotein in their blood and body fluids to stop ice crystals forming. (source: bbc)

The glass frog’s stomach is completely transparent. Close examination reveals a fully visible system of organs, including the heart, liver, and full intestinal tract. Scientists believe that earlier frogs of this species evolved to have this trait for camouflage; while perched on a leaf or branch, they are extremely difficult to spot from a distance. Different species can be found in Central and South American rain forests, usually in the canopy, far above the ground.  (source: factzoo)

A salp is a barrel-shaped, planktonic tunicate. It moves by contracting and pumping water through its gelatinous body. Salp jet propulsion is one of the most efficient in the animal kingdom. The salp strains the pumped water through its internal feeding filters, feeding on phytoplankton. (source: wikipedia)

Gaeotis flavolineata is a gastropod whose bright green shell has evolved to become too small for it to retract into fully — making it something in between a land snail and a slug. (source: pulptastic)

These “see-through” squid are commonly referred to as Glass Squid and there are approximately 60 different species in our ocean. The only part of their bodies that are tinted with color are their cigar-shaped livers. When these creatures do want to be seen (like when they are mating) they can use bioluminescence to put on a colorful show for viewers. (source: awesomeocean)