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Studying animals that no longer exist is far from simple. However, paleontologists have made great strides over the years, uncovering surprising facts. New studies continue to challenge previous theories or introduce species so peculiar that scientists are left puzzled.
10. Homo Erectus May Have Crafted Boats
When you picture our ancestor Homo erectus, seafaring cavemen probably aren't the first image that comes to mind. Sure, they journeyed out of Africa, across Asia, and even as far as Flores, but they did so on foot, right?
In 1998, scientists discovered stone tools on Flores that were dated to 800,000 years ago, suggesting they were crafted by H. erectus. To reach the island, these early humans would have needed to cross wide, rough waters, requiring some form of primitive boats or rafts. It’s generally assumed that H. erectus didn’t have the cognitive abilities for building or navigating boats.
Though it remains debated whether the Flores tools truly indicate boat-making, the idea is somewhat backed by more recent discoveries in Crete. In 2011, scientists dated tools found there to 130,000 years ago, believing they were made by Homo erectus. Reaching Crete would have certainly required sea travel.
9. Opabinia Regalis Gave Paleontologists A Good Laugh
Opabinia regalis was first identified in 1912. This small, swimming arthropod had a truly bizarre appearance. A 1930 reconstruction depicted O. regalis swimming upside down. A more accurate version was completed in 1972. When it was presented at a paleontologist's conference, the entire room erupted in laughter, assuming it was a prank.
Why not? The 505-million-year-old anomalocaridid sported five eyes on short stalks and a flexible, trunk-like proboscis that ended in a claw. O. regalis used this claw to drag prey into its rear-facing mouth.
Its body, while still strange (for its time), had 15 segments, each featuring lobe-like structures on each side, likely used for swimming. Some paleontologists speculate that the still-undetermined triangular features on O. regalis's body might have been small limbs for walking along the sea floor, though this theory remains controversial.
8. Ounalashkastylus Tomidai Was A Natural Vacuum Cleaner
In 2015, fossils discovered on Unalaska Island revealed a previously unidentified mammal species that lived 23 million years ago. Ounalashkastylus tomidai was a plant-eating creature roughly the size of a hippopotamus, dwelling along the island's coastal regions. The presence of an infant among the fossils suggested a breeding population once lived on Unalaska.
O. tomidai's most remarkable feature was its unique feeding style. It would close its jaws and suck vegetation into its mouth using powerful muscles. It primarily fed on sea grass, marine algae, and other plants. This feeding method is unlike any known in other mammals.
O. tomidai was part of the order Desmostylia, which is now extinct, with no living species remaining. On land, it would have moved much like a large sloth, while in the water, it swam similarly to a polar bear.
7. Tyrannosaurus Rex's Vision Was Among The Best Ever
You’ve probably heard the myth from Jurassic Park that Tyrannosaurus rex could only see moving objects, but that idea is more Triceratops dung than fact. In reality, T. rex had some of the sharpest vision in the animal kingdom.
T. rex boasted a binocular field of vision of 55 degrees, surpassing that of a modern hawk. This wide binocular range gave it excellent depth perception and the ability to see even stationary objects clearly. Its visual acuity was up to 13 times better than a human’s (by comparison, an eagle's vision is just 3.6 times sharper than ours). T. rex could likely spot objects from as far as 6 kilometers (3.7 miles) away, compared to the 1.6 kilometers (1 mile) a human can manage.
Some argue that T. rex's exceptional vision is a strong indication that it was more of a hunter than a mere scavenger. Over time, T. rex's eyes grew larger, its snout became lower, and its cheeks became less pronounced. In short, its vision improved.
6. Hallucigenia Had Teeth
Hallucigenia is a genus of tiny, wormlike creatures that lived 505 million years ago. Measuring less than 1 centimeter (0.4 in), they were bizarre in appearance, with spines along their backs and small legs on their undersides. When Hallucigenia was first discovered, paleontologists mistakenly thought the spines were legs, the legs were tentacles, and its front end was its rear.
In 2015, the head of Hallucigenia was conclusively identified and examined using an electron microscope. Along with a pair of eyes, this tiny worm shocked scientists with its mouth surrounded by teeth and rows of needlelike teeth in its throat. The teeth in its mouth likely helped generate suction to draw in food, while the throat teeth prevented it from escaping.
5. The Dinosaur With Smaller Arms Than T. Rex
When someone mentions a “dinosaur with tiny, useless arms,” the first creature that likely comes to mind is T. rex. However, Carnotaurus is the real deal. This large theropod lived in South America during the Late Cretaceous period and had exceptionally small arms.
The arms of Carnotaurus are easy to overlook, especially with the striking pair of horns adorning its head. These tiny arms, sometimes considered vestigial by paleontologists, were only a quarter the length of its already short humeri. Its four-fingered hands were equally diminutive.
Paleontologists are uncertain about why Carnotaurus developed such small arms. While they can trace the gradual reduction of front limbs in the dinosaur's ancestors, the reason why evolution favored this change remains a mystery.
4. The Snake With Four Legs
In Germany's Solnhofen Museum, there was a fossilized snake from the Crato Formation in northeastern Brazil, initially labeled simply as 'Unknown fossil.' When David Martill, a Crato Formation expert, saw the snake, he realized that it predated any known fossilized snakes by about 20 million years. He referred to it as 'the ancestor of all snakes.'
The fossil revealed an unexpected feature: it had four limbs. While snakes with two limbs had been discovered before, this was the first four-limbed snake ever found. Named Tetrapodophis amplectus, this creature lived 120 million years ago and likely used its limbs for grasping objects, not for walking.
T. amplectus is widely considered to be a transitional species bridging the gap between early lizards and modern snakes. Notably, the bones at the ends of its foot digits are unusually long, a characteristic commonly found in tree-dwelling animals.
3. The Gopher With Horns
Ceratogaulus was a prehistoric gopher that roamed North America between 5 and 16 million years ago. Measuring about 30 centimeters (12 inches) in length, this unique rodent sported horns. Ceratogaulus is the only known horned rodent.
There has been much debate over the purpose of its horns. Ceratogaulus descended from rodents that used their heads for burrowing, but its horns weren’t ideally positioned for such tasks. It’s unlikely the horns were used by males to compete for mates, as both males and females had them. Given its poor vision, Ceratogaulus probably didn’t use the horns for species recognition either.
The most plausible explanation is that these horns served as a defense mechanism. Positioned to protect its eyes and neck, the horns were sturdy and well-suited to deter predators. A predator poking its snout into a Ceratogaulus burrow would find itself meeting a set of horns. If caught aboveground, the prehistoric gopher could even use its horns to fend off attackers, like a Triceratops.
2. The Bird With Clubs On Its Wings
The Rodrigues solitaire, or Pezophaps solitaria, was a flightless bird about the size of a goose, closely related to the dodo. Native to Rodrigues Island in the Indian Ocean, this bird had a distinct feature on its wings: a round bony knob, often referred to as a “musket ball.”
These musket balls weren’t just a curious feature—they served as weapons. In a living solitaire, these knobs would have been covered in tough skin, enhancing their effectiveness in combat. With powerful wing muscles, the birds could swing these musket balls forcefully, causing fractures to rival birds. Males had the largest knobs.
Historical records paint the Rodrigues solitaire as an aggressive species. There are no other known birds with wing clubs like those of this species. Unfortunately, the Rodrigues solitaire became extinct after European settlers arrived on the island, long before the birds could be used in cockfights.
1. Diplodocus Tails Broke The Sound Barrier
It’s commonly believed that sauropods like Diplodocus used their long, whiplike tails as a means of defense. The tails were proportionally similar to bullwhips, and it’s thought that their tips could have actually broken the sound barrier.
Simulations of Diplodocus and Apatosaurus tails revealed that a flick of only nine degrees could propel the tail tip to a speed of 1,200 kilometers per hour (750 mph). The resulting sound would have been more akin to the blast of a cannon rather than a whip crack. These tails likely had a horizontal range of motion of about 30 degrees.
Paleontologists have suggested that tail-cracking might have served as a form of communication or a way to compete for mates. Some tail fossils show signs of strain, potentially indicating overuse in tail-cracking activities.
