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A see-through Kermit

Uncharted territory may be dwindling on our planet, but biologists discover hundreds of new species every year. Here are our recent favorites...including a wasp that will absolutely terrify you.

This new species of glass frog, dubbed Hyalinobatrachium dianae, was recently found by researchers at the Costa Rican Amphibian Research Center. Looks cute, right? Well, flip it over. It's completely see-through under there. You can see its organs and blood vessels and everything.

Updated:Caption:Photo:Brian Kubicki/Costa Rican Amphibian Research Center
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So cute it's scary

The 7-inch-long flapjack octopus has been on researchers' radar since 1990, but many details about how it lives are still a mystery, and it has yet to be officially named. This little guy was photographed by aquarists at the Monterey Bay Aquarium Research Institute at about 1,080 feet below the ocean's surface.

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Small shrimp, huge "appendage"

This newly discovered Leucothoe eltoni shrimp is named after Sir Elton John.

"I have listened to his music in my lab during my entire scientific career," James Darwin Thomas, a professor at Nova Southeastern University, said in a statement released by publisher Pensoft. "So, when this unusual crustacean with a greatly enlarged appendage appeared under my microscope after a day of collecting, an image of the shoes Elton John wore as the Pinball Wizard came to mind."

Updated:Caption:Photo:James Darwin Thomas, Ph.D., Nova Southeastern University
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Hair down there

This white-cheeked macaque was discovered in April 2015 by researchers at Dali University’s Institute of Eastern-Himalaya Biodiversity Research. The feature that gave it away: a distinctive-looking penis and unusually hairy scrotum.

The beast may be new to science, but according to researchers, it's already threatened by illegal hunting in Tibet.

Updated:Caption:Photo:Cheng Li, Imaging Biodiversity Expedition, and Tibet Forestry
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Elusive bird

Meet the new Sichuan bush warbler. Discovered in part by Pamela Rasmussen, an integrative biologist at Michigan State University, the bird has a shy disposition and a distinctive song.

Updated:Caption:Photo:Pamela Rasmussen/Michigan State University
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See-through "shrimp"

This ghostly, shrimp-like creature was discovered by a team from the University of Seville in Spain in 2013. The new species, which are actually members of another crustacean group called amphipods, live in caves off the coast of Catalina Island, near Los Angeles.

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Fairy-like moth

The enigma moth, announced just this year by the Commonwealth Scientific and Industrial Research Organisation in Australia, has been described as a "living dinosaur," part of a group of moths with ancient roots. Their adult lives are lived in a single day, in which they emerge from their cocoons, mate, reproduce and die.

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Toothy frogs

Meet Limnonectes larvaepartus. Discovered in late 2014 by scientists at the University of California at Berkeley, the frog has fangs, sort of -- two projections on its lower jaw that are used for fighting. But it gets better. This species also gives birth to live tadpoles, which may be guarded early in life by protective frog fathers.

Updated:Caption:Photo:Jim McGuire/University of California Berkeley
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Fanged frogs give live birth

Here's a closeup of the newly unveiled Limnonectes larvaepartus tadpole, a rare example of live young borne of a frog species.

Updated:Caption:Photo:Jim McGuire/University of California Berkeley
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Red dragons

Announced just last month, this vibrant ruby seadragon proves that "we definitely have many more exciting discoveries awaiting us in the oceans," according to co-discoverer Nerida Wilson of the Western Australia Museum.

Updated:Caption:Photo:Western Australia Museum
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New fish

Here's a newly discovered species of ghost shark, the Chimaera carophila, from New Zealand. The California Academy of Sciences introduced it to the world in December last year.

Updated:Caption:Photo:California Academy of Sciences
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Living branch

That's no stick, but rather a very, very large new species of stick bug, discovered in late 2014 in Vietnam. It's more than a foot long, making it the second-biggest living insect ever found.

Updated:Caption:Photo:Royal Belgian Institute of Natural Sciences
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Fearless ant

All hail the hero ant from Madagascar, discovered last year. When it senses an invading insect, it grabs the intruder and hurls itself off the ant equivalent of a cliff. Once the unwelcome guest is away from the colony entrance, the ant picks itself up and gets back to work.

Updated:Caption:Photo:California Academy of Sciences
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Vicious wasp

Sure, this bone-house wasp, unveiled in July last year by scientists at the University of Freiburg in Germany, looks like any other stinger. But it's way meaner: it uses ant corpses to build its home, and lays its eggs inside living spiders. Pleasant dreams!

Updated:Caption:Photo:Michael Staab/University of Freiburg, Germany
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I'm hoppin' here

Yep, this newly categorized leopard frog, announced in October last year by a graduate student at Rutgers University, is 100 percent New Yorker: it was discovered near the Statue of Liberty. It also has a loud, guttural call.

Updated:Caption:Photo:AP Photo/Rutgers University, Jeremy Fineberg
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This nudibranch is a new slug species called the Phyllodesmium undulatum. Unveiled in 2014 by the California Academy of Sciences, it's essentially a poison-eating sea slug that glows.

Updated:Caption:Photo:California Academy of Sciences
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Battle-ready spider

That tiny dot at the bottom of the web is a newly categorized ray spider, discovered in 2014 by an arachnologist at the California Academy of Sciences. "Ray spiders aren’t filter feeders," the Academy's Charles Griswold said. "They tend to stretch their sticky webs into a cone-like shape and hold on tightly while they wait for unsuspecting prey. Once spotted, they shake or let their webs fly out to catch a meal."

Updated:Caption:Photo:California Academy of Sciences
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Smallest sengi

This relatively tiny species of Namibian elephant shrew, Macroscelides micus, debuted last year as well. Only about a dozen new mammal species are discovered yearly.

Updated:Caption:Photo:California Academy of Sciences
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Massive eel

Yes, this Pylorobranchus hearstorum worm eel, which officially debuted in 2014, is the largest of its kind, about 50 inches long from head to tail, making it about twice as long as other known worm eels. But if that isn't mind-blowing enough, consider: the worm eel is actually neither worm nor eel. It's a fish.

Updated:Caption:Photo:California Academy of Sciences
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Bright frog

The vast majority of Telmatobius frogs, including the newly catalogued yellow Telmatobius ventriflavum, discovered by Alessandro Catenazzi, are considered threatened. The yellow variant was officially recognized as a new species in February.

Updated:Caption:Photo:Alessandro Marco Catenazzi
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Deadly sponge

Announced by the Monterey Bay Aquarium Research Institute in April 2014, these shrub-like sponges trap small sea creatures and then digest them over several days.

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