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Rare animals featured in Planet Earth, Our Planet, and other nature documentaries

  • Rare animals featured in Planet Earth, Our Planet, and other nature documentaries

    Life on Earth can be hard. But life itself, in all its forms, is what makes this planet so unique. Organisms have adapted to thrive in some of the most inhospitable environments; places where scientists once believed it was impossible for living creatures to even exist, let alone flourish. In every corner of the planet, whether it is a mile below the surface of the ocean completely out of reach of the sun, or right in our backyard, life—as the beloved "Jurassic Park" mathematician Dr. Ian Malcolm would say—finds a way. And for the luckiest on Earth, their lives may even be narrated by the great David Attenborough.

    The BBC’s Natural History Unit has produced 150 documentaries since 1957 with more on the horizon. Over the past 20 years especially, advances in technology have allowed documentary filmmakers to give audiences unprecedented perspectives of the natural world. Released in 2006 after five years in the making, "Planet Earth" was the first nature documentary shot in high definition. Ten years later, the sequel, "Planet Earth II," became the first shot in ultra-high definition. These are just two of many documentaries that introduced us, in stunning detail, to the unknown worlds within our own.

    Flora and fauna never before seen made their debuts on film. Things we thought were familiar revealed themselves to be surprising when observed from a new vantage point. What these films have done best is to show us the staggering scope, complexity, and interconnectedness of nature. Stacker wanted to highlight just a few examples of these unexpected revelations from some of the most popular nature documentaries over the past two decades.

    What does rare mean in this context? We watched every episode of "Blue Planet I," "Blue Planet II," "Planet Earth I," "Planet Earth II," "Life," "Africa," and "Our Planet," and pulled out examples of unique occurrences in the natural world. Rare includes animals not often seen, animals with extreme survival tactics, those with small geographic distribution, and those with remarkable evolutionary adaptations.

    Read on for a sampling of some of these rare and spectacular animals.

    You may also like: Animal species that may become extinct in our lifetime

  • Monarch butterflies

    - Documentary featuring this animal: "Life: Insects"

    While monarch butterflies are common, their migration is exceedingly mysterious. Each year, monarchs travel more than 3,000 miles from Canada to a small patch of Oyamel fir trees in the mountains of Mexico before the winter temperatures set in. Exactly how they find their way to this bit of forest is still unknown.

    The monarchs gather by the millions in the branches of the Oyamel firs, which create a climate optimal for hibernation. The roundtrip journey is completed throughout several generations with one “super generation” that makes the entire trip south, hibernates, starts the return journey, and breeds the next generation all in eight months. What makes this so extraordinary is that every other generation lives between five and seven weeks to complete their leg of the return trip back to Canada.

  • Amazon river dolphin

    - Documentary featuring this animal: "Planet Earth II: Jungles"

    The Amazon river dolphin, also known as the boto, is a freshwater dolphin that lives in the Amazon River basin and spends the wet season swimming deep among the trees when the river floods the rainforest floor. Although no consensus has been reached within the scientific community on how exactly these dolphins made the biogeographic leap from ocean to river, some experts believe they branched off from their more familiar marine relatives roughly 15 million years ago during retreating sea levels of the Miocene epoch. Since then, adaptations like long narrow snouts for hunting, unfused vertebrae allowing them to bend to 90-degree angles, and refined echolocation have made these river mammals adept hunters among the flooded tributaries of the Amazon rainforest.

  • Railroad worms

    - Documentary featuring this animal: "Planet Earth II: Jungles"

    Railroad worms are some of the most specialized hunters on the planet. These worms, named for their resemblance to lighted windows on a passenger train, are actually poisonous beetles that look like caterpillars. Females produce a bioluminescent glow caused by a chemical reaction between the molecule luciferin and the enzyme luciferase; it’s the same reaction that gives fireflies their signature glow. These lights serve as a warning to other predators to stay away. Certain species of railroad worms are also equipped with a red bioluminescent light on top of their heads, which they can turn on and off. Many insects, like millipedes, can’t see red light, giving the railroad worm a distinct advantage in the dark.

  • New Zealand glow worms

    - Documentary featuring this animal: "Planet Earth I: Caves"

    Like the railroad worm, these insects aren’t actually worms at all, but a variety of beetle. Few bioluminescent displays in nature are quite as mesmerizing as that of a cave ceiling full of blue lights from the Arachnocampa luminosa, also known as the New Zealand glow worm. Deployed primarily as a hunting tactic, the light of the glow worm emitted from its lower abdomen is used to attract insects and ensnare them in beaded strings of slime the glow worm also produces.

    The insect uses digestive saliva to liquefy and subsequently suck out the inside of its prey. Only females have the ability to glow. The glow worm’s light is also one of the few examples in nature of the female in a species using ornamentation to attract a mate. Scientists are unsure what advantage this provides to female glow worms.

  • Deep-sea hatchetfish

    - Documentary featuring this animal: "Blue Planet II: The Deep"

    Life in the deep is mostly a game of deception. Many deep-sea species are equipped with highly specialized bodies made for evading predators. But predators have special adaptations, too. Take the deep-sea hatchetfish, for example. Predators of the hatchetfish distinguish their prey by looking up, locating their silhouettes against the backdrop of what little light filters down from above.

    Hatchetfish have rows of photophores, or light-producing cells, in their translucent bellies, which they can use to exactly match the color of the light filtering down. This makes them almost invisible from below. It would seem to be a perfect evolutionary adaptation. But Mother Nature always seems to have the checkmate ready. It has been discovered that predators of the hatchetfish have eyes that can distinguish between light produced by photophores and light produced by the sun.

  • Velvet worms

    - Documentary featuring this animal: "Our Planet: Jungles"

    Velvet worms are some of the oldest and most bizarre living creatures on the planet. They’ve existed, almost entirely unchanged, for over 500 million years; that’s long enough to see dinosaurs come and go. Most species of velvet worms are found in moist tropical or coastal areas and feed on other small invertebrates. And their preferred method of hunting? Rapid-firing swinging jets of immobilizing slime, followed by an injection of digestive saliva that liquefies their prey.

  • Philippine eagle

    - Documentary featuring this animal: "Our Planet: Jungles"

    The critically endangered Philippine eagle, found only on four islands in the Philippines, is one of the rarest birds on Earth. Loss of their natural forest habitat due to commercial logging has reduced their numbers to fewer than 400 globally. Conservation efforts include researching and monitoring the current populations, as well as enforcing laws around habitat management.

    After their initial discovery in the late 19th century, they were commonly referred to as “monkey-eating eagles” because it was believed their diet consisted exclusively of monkeys. It has since been discovered that Philippine eagles feed on a variety of prey. It is estimated that these eagles can live between 30 and 60 years and can reach heights of over 3 feet with wingspans of 7 feet, making them some of the largest birds of prey in the world.

  • Gulper eels

    - Documentary featuring this animal: "Blue Planet II: The Deep"

    Gulper eels, like many of their deep-sea neighbors, look like the stuff of science fiction. Life at extreme depths—over a mile down—has led to extreme biological adaptations for the survival of marine species. For the gulper eel, this means an enormous mouth to capitalize on any infrequent prey that swims by, regardless of size, attached to a meter-long tail with a bulb at the bottom, which acts as a lure. The gulper eels’ large mouths—large enough to swallow prey as big as the eels themselves—have earned them the nicknames “pelican eels” and “umbrella-mouth gulpers.”

  • Birds of paradise

    - Documentary featuring this animal: "Our Planet: Jungles," "Planet Earth I: Pole-to-Pole"

    When it comes to courtship, you would be hard-pressed to find a species more dedicated or more exuberant than the bird of paradise. There are over 40 species of birds of paradise, each with their own unique courtship rituals and striking plumage. It is the male birds of paradise that sport elaborate ornamentation, like streamers or bright breast feathers, to attract a mate. But what’s a costume without a performance? Males also dance, showing off their colors and shifting their bodies into various shapes, making them almost unrecognizable as birds.

  • Snow leopards

    - Documentary featuring this animal: "Planet Earth II: Mountains"

    Sometimes referred to as “ghost cats” because of their elusive nature, snow leopards are extremely rare. Little is known about their lives in the mountains of Central Asia, and because there is so little prey to sustain large populations, there are only around four snow leopards per 40 square miles. It wasn’t until 1971 that the first image of a snow leopard in the wild was captured by biologist George Schaller. Even today, capturing them on film requires meticulous tracking, motion sensors, infrared technology, and an abundance of patience.

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