Buzz
Although reptiles often dominate the conversation about living fossils, there are also mammals, trees, and birds that are surprisingly ancient. Some have existed in their current form alongside dinosaurs.
10. White-Tailed Deer – Million Years
White-tailed deer are the oldest surviving deer species today. Their endurance for over million years is no accident—these elegant creatures have maintained their adaptable design because it continues to work efficiently.
White-tailed deer have several survival tricks up their sleeves. They’re not picky eaters, consuming nearly anything, even meat and fish. However, grass is off their diet. Lacking the specialized teeth and stomach required for grazing, they can’t digest grass like other deer. These adaptable animals live in environments ranging from the Arctic Circle to Brazil, covering the largest range of any hooved species.
These deer also employ clever safety strategies. They’ll circle over their tracks to confuse predators. When fleeing, they follow familiar escape routes, easily navigating obstacles to slow down and disorient their pursuers. Sometimes, they even lead predators to other deer to throw them off. In a pinch, they’ll wade through water to erase their trail or hide underwater. If need be, they’ll even venture into the ocean, a place no self-respecting bobcat will dare follow.
In good years, a doe may give birth to twins or triplets. Fawns are skilled hiders, emitting no scent for the first few days. Their dappled coats help them blend into the surroundings, and they remain motionless at the slightest hint of danger. From birth, these deer are designed for survival.
9. Zebra – 4 Million Years
These striped equids of the African plains have been around for an extensive period. The Grevy’s zebra, considered the oldest zebra species, is now a rare sight. Zebras diverged from the proto-horse lineage around four million years ago. Today, zebras exist in three species and over 10 subspecies, all characterized by their distinctive Mohawk-style hair and unique barking calls.
Despite sometimes overlapping territories, the various zebra species do not interbreed. Each species has a different number of chromosomes, and efforts to breed Grevy’s zebras with mountain zebras have resulted in numerous miscarriages.
The extinct quagga was a subspecies of the plains zebra, which is the most common zebra species today. They separated during the Ice Age, around 120,000 to 290,000 years ago. DNA analysis of quagga remains indicates that it evolved from a group of plains zebras that became isolated, developing the quagga's distinct coloration and body shape.
The closest equivalent America once had to its own zebra was the Hagerman horse, a creature resembling the Grevy’s zebra that roamed the shores of the now-extinct Lake Idaho around three million years ago.
8. Red Panda – 5 Million Years
The endangered red panda shares a common ancestor with the giant panda, along with its false thumb, fondness for bamboo, and some shared territory in China. However, unlike its black-and-white relative, it does not belong to the bear family.
This charming, kitten-like creature has been around for five million years, and its bamboo-eating habits are thought to be an ancient trait. Even older fossils of red panda-like animals found in Eastern Europe and North America might date back as far as 25 million years.
For many years, this so-called 'firefox' baffled scientists with its classification. It was grouped with raccoons for quite some time, likely because of its masked face and ringed tail, which helps it balance when climbing trees. It also uses its front paws like hands, dipping them into rivers for a drink. However, DNA analysis eventually led scientists to classify it in its own family group, Ailuridae.
It's fortunate that these bushy-tailed animals also feed on insects, eggs, small birds, rodents, and fruit, as their digestive system is poorly equipped to handle plant material. Only about a quarter of the nutrients from bamboo are absorbed.
7. Sandhill Crane – 10 Million Years
Among the 15 species of cranes that still exist, the sandhill crane boasts the largest population and the broadest range. The oldest known fossil of this species was found in Florida, dated to 2.5 million years ago, though it may not be the oldest. A more compelling fossil discovered in Nebraska, dating back about 10 million years, closely resembles the sandhill crane we know today. This would make it the oldest living bird species on Earth.
From March to April, an awe-inspiring 500,000 grey-blue sandhill cranes with red caps migrate to Canada and Alaska, sometimes traveling up to 650 kilometers (400 miles) in a single day. These cranes perform elegant dances to find a lifelong mate and then settle into wetlands to nest and raise their young.
Chicks are born with their eyes open, can walk within eight hours of hatching, and are even capable of swimming. Adult cranes care for their young for nearly a year—up to 10 months—defending them by hissing or kicking at any predators. While the species is generally not at risk, the Mississippi sandhill crane and the Cuba sandhill crane are now considered endangered.
6. Hedgehog – 15 Million Years
Believe it or not, this tiny mammal has been spreading its prickly charm for the past 15 million years, and not as a distant ancestor. The hedgehogs of today are virtually identical to those from ancient times.
Their iconic quills are hollow spikes made of keratin, the same protein found in human hair and nails. When born, hedgehog babies have small, barely visible quills beneath their skin, and they soon develop their characteristic spiky appearance. The 'hog' part of their name comes from the pig-like squeals and grunts they make while foraging for food and communicating with each other.
Not all hedgehogs curl into a protective ball or hibernate in the winter; it varies by species. Some desert hedgehogs prefer to flee from danger and only curl up when absolutely necessary. While modern hedgehogs are small enough to fit into a person’s hand, their smallest ancestor, *Silvacola acares*, was a primitive species that lived 52 million years ago and was about the size of a human thumb.
5. Flamingo – 18 Million Years
What was once a Spanish lake during the Miocene era is now a stretch of limestone. Within it, researchers have uncovered a nesting site—eggs included—that they believe belonged to a prehistoric flamingo dating back 18 million years.
Microscopic scans revealed that the five eggs were strikingly similar to those of modern flamingos. However, there were some differences. The fossilized nest was built from plant materials like twigs and leaves, in contrast to the mud towers constructed by today’s flamingos. Additionally, modern flamingos lay only one egg per nest, not five. Since the nest resembled those of modern grebes, a diving bird and close relative of flamingos, some researchers suggest it may have belonged to an ancestor of both species.
Baby flamingos are born grey or white and develop their vibrant pink feathers over the course of a few years. This pink color comes from a reddish-orange pigment called beta carotene—the same compound found in carrots and pumpkins—found in specific algae and crustaceans. If a flamingo were to stop consuming these foods, its feathers would gradually lose their color.
4. Aardvark – 35 Million Years
Resembling a blend of a kangaroo and a pig with claws, this fascinating mammal has undergone little change in the last 35 million years. The aardvark has primitive teeth that lack enamel and roots, no collar bones, and walks with webbed feet. This elusive creature, both in life and the fossil record, is a rare find.
Scientists believe that the aardvark is a genetic anomaly, with its genes evolving minimally compared to other mammals. In fact, its evolution has been so limited that researchers consider the African aardvark to be the closest living relative to the common ancestor of all mammals that share similar chromosomes.
Determining an aardvark’s gender is tricky at first glance, but males are generally larger, weighing up to 100 kilograms (220 lbs). Females give birth to a single, hairless cub during the breeding season. The aardvark’s diet consists primarily of ants, which it consumes using its sticky, ribbon-like tongue. Despite its similar feeding habits, the aardvark is not related to the South American anteater.
The aardvark is the sole survivor of an ancient group of animals that dates back to the time of the dinosaurs. Though not as old as their family classification, aardvarks have been feasting on ants for a staggering 35 million years.
3. Ginkgo Biloba - 200 Million Years
The ginkgo biloba tree, commonly found in cities, is often overlooked, but it boasts an extraordinary history. As the oldest tree species still in existence, it has remained unchanged for over 200 million years.
The seeds of the ginkgo tree have a foul odor, likened to vomit, which is believed to attract animals that help spread the species. The Chinese were the first to recognize its value around 1,000 years ago, propagating it primarily as a nut tree. The seeds are still used medicinally today, and various health products in the West are made from an extract of the ginkgo's unique, pest-resistant leaves. All other ginkgo relatives have long been extinct, leaving only the ginkgo biloba tree to endure the challenges of time, including surviving an atomic bomb. A tree near a Japanese temple, just 700 meters from the Hiroshima bomb's epicenter in 1945, miraculously sprouted new leaves the following spring.
This species is renowned for its incredible longevity, remaining young even at the age of 100. Its survival against the odds can be partly attributed to its resilience to pests and diseases and its remarkable ability to regenerate under stress. Yet, the questions surrounding its evolution, its original pollinators, and the extinction of other ginkgo species continue to intrigue and puzzle botanists.
2. Indian Purple Frog - 134 Million Years
The purple frog lived alongside the dinosaurs for around 70 million years, survived the catastrophic event that caused their extinction, and has now reached modern times, astonishing scientists. This rare amphibian, which grows to about 7 centimeters (2.75 inches) in length and spends the majority of its life underground, was recently discovered in the Western Ghats Mountains of India.
Scientists soon had to create an entirely new family for the purple frog when DNA tests revealed its uniqueness among frogs, confirming that it does not belong to any other group currently in existence. This strange creature has a small, pointed face directly attached to its blob-like body, without a clear head or neck. During the monsoon season, purple frogs emerge from their burrows to mate and primarily feed on termites. Their underground habitat makes them difficult to find, leading scientists to be uncertain about their current population in the wild.
As living fossils, these frogs are crucial to our understanding of amphibian evolution and how species adapted to ancient landmass shifts. The purple frog itself survived such a landmass separation around 65 million years ago when the Seychelles split from India.
1. Virginia Opossum - 70 Million Years
North America's only marsupial is a unique blend of cuteness and grit, resembling both a teddy bear and a sewer rat. With a fossil record spanning back 70 million years, the Virginia opossum ranks as one of Earth's oldest mammals. Despite the passage of time, it has maintained its basic form. Similar to the kangaroo, it carries its young in a pouch so resilient that it can even shield the babies when the mother is struck by a vehicle. The pouch is also waterproof, ensuring that the tiny newborns stay dry while the mother swims.
No one knows exactly how long the Virginia opossum has relied on its famous survival tactic of 'playing possum' in the face of danger, but it is incredibly skilled at it. When there are no other options, this mild-mannered marsupial can faint for up to six hours, slowing its heartbeat and breathing in an effort to convince predators that it is dead. This tactic is most commonly seen in juveniles and occurs only when absolutely necessary, as they don’t use it frequently. It’s a gamble that the predator hunting them prefers live prey over carrion.
Another defensive strategy of the opossum is to reveal its 50 teeth—more than any other mammal—while drooling and foaming at the mouth in an attempt to appear too diseased to eat.
