Buzz
Most of Earth's species have disappeared. However, humanity remains captivated by these ancient beings, especially the truly unusual ones. Recently, some fascinating fossils have been discovered.
These finds have uncovered unexpected insights into animal behavior, appearance, and evolutionary patterns. Some were simply mind-boggling, while others, dating back millions of years, provided unprecedented views of rare soft tissues and unusually fresh remains.
10. The Lost Bone
In 2017, a museum curator discovered a forgotten box at a Japanese university. Inside, there was a dinosaur femur along with a note bearing the name of the person who had originally discovered it. Intrigued by the species and its historical context, a new analysis was conducted.
The analysis overturned the long-held assumption that the bone belonged to a dinosaur. Instead, it was determined to be from an extinct aquatic mammal. This creature, resembling a mix of a manatee and a hippopotamus, roamed the Pacific Ocean 15.9 million years ago.
The herbivorous animal, part of the now-extinct genus Paleoparadoxia, reached lengths of up to 2 meters (6.5 ft). The fossil’s age confirmed what scientists had long suspected—that Paleoparadoxia inhabited the oceans 10 to 20 million years ago.
Interestingly, this particular bone displayed muscle scars. These markings reveal how the muscle was engaged during the animal's lifetime, potentially offering insight into the movement of its back leg.
Ironically, the villager who found the femur recognized it wasn’t a dinosaur bone. In fact, during an interview, he mentioned that it belonged to the extinct order of aquatic mammals, Desmostylia. It’s clear he had shown it to a scientist, yet the matter was never pursued. The bone was eventually forgotten, stored away as an unclassified “dinosaur” specimen.
9. A Proto-Mammal Brood
Around two million years ago, a mammal gave birth to an extraordinary litter of 38 offspring. However, it wasn’t exactly a mammal. Kayentatherium wellesi was a cynodont, a mammalian ancestor from the Jurassic period. The furry creature, roughly the size of a beagle, offered remarkable insights into evolution.
The 2018 study sought connections between these unusual fossils and modern mammals. The 185-million-year-old litter was twice as large as those of any living species today. This characteristic was more aligned with reptiles than mammals.
The offspring also exhibited a distinct feature. Unlike most young mammals today, who are endearing due to their large heads and short faces, these babies didn’t have bulbous skulls to appear cute but to accommodate larger brains.
The ancient young ones had such small brains that their skulls required almost no structural modification. Their 1-centimeter-long (0.4 in) heads were perfect replicas of the adult female’s.
This is a once-in-a-lifetime find for researchers, as it highlights the absence of a crucial evolutionary step. At one point, mammal litters began to shrink as their brains expanded. The furry marvel and her large brood demonstrated that this transition had not yet occurred during the Jurassic.
8. The Platypus Fish
Around 175 million years before dinosaurs roamed the Earth, a stunning coral reef thrived near Australia. It was home to the first reef fauna, and the dominant fish group was placoderms—jawed vertebrates often covered in armor.
In 2018, researchers undertook the reconstruction of a species named Brindabellaspis stensioi. By analyzing fossils dating back up to 400 million years, the study unveiled one of the region’s most bizarre fish.
In addition to having nostrils located in its eye sockets, Brindabellaspis possessed a peculiar skull. Its jaws, in particular, resembled the snout of a platypus. This armored fish likely glided along the seafloor, similar to a stingray, searching for the electrical signals of prey buried in the mud.
This revelation followed an unexpected finding. The snout was equipped with a sensory system, which led scientists to recognize that it was a modified version of the pressure sensors found in other fish.
It’s unfortunate that placoderms are extinct, as a living specimen would have helped solve another perplexing puzzle. Brindabellaspis is so unusual that its exact place in the evolutionary tree remains unclear.
7. A One-of-a-Kind Snake
Around 99 million years ago, a baby snake perished shortly after hatching in Southeast Asia. Tree resin enveloped the newborn, and over time, the sap transformed into amber. The perfectly preserved reptile (though its head was missing) eventually found its way into a private collection.
In 2018, the specimen became available for scientific examination in China, unveiling several surprises. The hatchling was confirmed as the oldest baby snake ever discovered. Accompanying it was a scrap of skin, belonging to an adult snake, though it was too small to determine whether it came from the same species.
The baby’s 97 vertebrae identified it as an unknown snake species. Each vertebra bore a unique structural feature not seen in other snakes. Dubbed Xiaophis myanmarensis, this snake was also one of the most primitive known. The question of its habitat was resolved by the insects and plants trapped in the amber, which revealed that Xiaophis lived in a forest environment.
6. The Oldest Known Animal
For decades, a peculiar blob divided the scientific community. Discovered in 1947, the fossils of Dickinsonia featured flat, oval bodies that could grow up to 1.4 meters (4.6 ft) long. Another perplexing trait was their deeply ribbed appearance. Experts couldn't agree on whether it was a plant, an animal, a fungus, or perhaps a colony of some sort.
In 2018, a bold attempt was made to determine the identity of this 558-million-year-old organism. To complete the analysis, a fossil containing organic matter was required. A frosty fossil bed in Russia was selected, and samples had to be extracted from a high cliff while suspended by rope. The effort proved successful.
Fossils of Dickinsonia were recovered, and one well-preserved specimen contained cholesterol. The fat molecules not only confirmed that the ribbed blob was Earth's earliest animal but also demonstrated that animals could grow large and be abundant long before scientists previously thought possible.
5. A Snail That Appears Alive
In 2016, researchers acquired a piece of amber from a private collector. Encased in the ancient resin was something that paleontologists thought they'd never encounter—two snails.
At 99 million years old, these were the oldest snails ever discovered in amber. One, in particular, was truly remarkable. It was so well-preserved that it appeared lifelike.
The snail’s posture indicated a tragic fate. It was stretched forward with a cloud of bubbles surrounding its head, capturing the exact moment of its death. As the tree resin began to encase the snail, it attempted to escape but ultimately failed. Once fully trapped, air likely escaped from its lung, gathering around its head.
This discovery offers the first look at a prehistoric snail’s soft tissues. It helped identify the creature as a likely ancestor of the living Cyclophoridae family of snails, the oldest cyclophoroideans found in Asia.
4. The Oldest Dandruff
In 2018, researchers examined the fossilized remains of a 125-million-year-old dinosaur and uncovered flakes on its skin. These flakes were identified as the world’s oldest dandruff. The unfortunate bad hair day—or rather, feathers—belonged to a microraptor, about the size of a crow. This predator had four winged limbs, though it didn’t use them for flight.
The flakes were made up of corneocytes, cells packed with the protein keratin. Modern birds have corneocytes that are loosely arranged and contain a lot of fat. This design helps cool them after flight. However, the microraptor's dandruff lacked fat, suggesting it hadn't adapted to an airborne lifestyle.
Two other genera, Beipiaosaurus and Sinornithosaurus, were also found in the same rock formations in northeastern China. Both species had dandruff as well.
Although feathers were just beginning to evolve during this period, these three specimens demonstrated that dinosaurs had already adapted their skin into a modern feature (feathers). The flakes also provide the only evidence that dinosaurs shed their skin as dandruff, rather than in large sheets or as a single piece like reptiles.
3. The Oldest Nervous System
Chengjiangocaris kunmingensis was a shrimp-like organism that lived in South China about 500 million years ago. Recently, a pair of complete fossils was uncovered, revealing a strange line running the length of the body.
Upon closer inspection, the line turned out to be a preserved nerve cord. Fossilized soft tissue is an extreme rarity, so this was a truly extraordinary find. Not only is it the oldest nervous system ever discovered, but it’s also the best-preserved example. Researchers had never encountered anything like it.
The nerve cord had a ‘beaded string’ appearance due to clusters of nerve tissue. These clusters became progressively smaller as they moved down the central cord toward the tail. Additionally, each cluster was connected to a pair of legs. Interestingly, the legs diminished in size the further they were from the front of the creature.
C. kunmingensis was an early relative of arthropods (insects, arachnids, and crustaceans). However, its nerve structure more closely resembled that of modern worms. A similar design can be found in living arthropods, but with fewer nerves. The reason behind this reduction is still unclear.
2. The Lungs of Birds
When a fossil was recently discovered in China, it marked an exciting discovery. The creature, named Archaeorhynchus spathula, was a tiny bird that lived 120 million years ago.
Only four other specimens had been discovered. This one stood out due to its remarkably well-preserved feathers, which revealed a tail feature, common in modern birds, that had never before been seen in Mesozoic-era avians.
During the analysis, something more astonishing came to light that overshadowed the bird’s rarity. The chest area exhibited a white-speckled lobed structure, which turned out to be fossilized lungs. Soft tissue is incredibly rare to survive over millions of years, but researchers are confident these are indeed lungs.
The shape, position, and respiratory characteristics of the lobes were strikingly similar to the lung system of modern birds. Several samples from the lungs showed the same air capillaries and cells.
When the mass extinction event struck 66 million years ago, many bird species also disappeared. However, the lineage of Archaeorhynchus spathula persisted, likely due to its advanced physical traits.
1. Unusual Movement
In 2016, a paleontologist and a group of students were hiking in the Grand Canyon when they discovered 28 tracks. These footprints were an astounding 310 million years old, making them the oldest ever found in the Grand Canyon.
The creature responsible for the footprints walked in an unusual way. The tracks displayed a distinct diagonal stride, with each step angled 40 degrees off the main trail. It almost appeared as though the animal was sidestepping, as if moving to a line dance.
One possible explanation is that strong winds pushed the creature off course as it tried to move forward. Another theory is that the animal was attempting to maintain its balance while moving across an unstable surface, like shifting sand dunes.
The strange gait remains a mystery, as does the species that left the tracks. Researchers could only conclude that the creature was a four-legged reptile.
The tracks bear a striking resemblance to 299-million-year-old prints discovered in Scotland during the 19th century. At the time, these Scottish fossils were classified as Chelichnus, a general grouping. If further analysis connects them to the Grand Canyon tracks, the latter could be revealed as the oldest example from this mysterious group.
