Buzz
Every living creature on Earth is somehow connected to others. This vast genetic web only grows more intriguing and bizarre as scientists dig deeper. Unveiling new connections presents a captivating genetic mystery where the most unlikely creatures might share a common ancestor. It's also an essential key to understanding evolution. The more species are related, the more they reveal about their history, their family tree, and the overall evolution of life on Earth.
10. Scorpions and Ticks
While many people assume ticks are insects, they are, in fact, true arachnids, more closely related to scorpions and spiders. This ancient lineage has a fascinating past, with some genetic research suggesting these creatures may have been around even before the dinosaurs, crawling across the Earth's surface as far back as 400-450 million years ago.
Both ticks and scorpions rely on their remarkable sense of smell to find their next meal, and both can only consume liquid food. Ticks feed on blood, while scorpions use their versatile venom to paralyze and liquefy their prey’s insides, which they then drink. Of the two, scorpions are better equipped to survive prolonged periods without food. They can go without eating for up to a year by adjusting their oxygen consumption and slowing their metabolism. Due to the lack of significant fossil records for these arachnids, the same genetic study that placed them in ancient times also supports the theory that they share a common ancestor from the ocean depths.
9. Jellyfish and Coral
One glides through the water like a fish, while the other grows like a plant, yet both are animals at their core. Jellyfish and coral belong to the cnidarian family, which consists of bell- or tube-shaped creatures capable of delivering a painful sting with their tentacles. Despite their similar origins, their appearances and behaviors make it hard to see the connection. Jellyfish sting swimmers and pulse through the ocean, while coral seems more like a collection of twig-like plants that stay rooted.
The connection between them lies in their basic structure. Cnidarians are sac-shaped animals with a central opening surrounded by tentacles, a feature most clearly visible in jellyfish. The so-called coral 'frames' often seen in novelty shops are not the actual animals, but a limestone coating that they build for protection and to anchor themselves to reefs. The tiny individual corals are simple cup-shaped creatures with a single opening that serves both as a mouth and an exit for waste. They extract calcium carbonate from the ocean to build the limestone structures we associate with coral. Thousands of tiny coral animals gather around these limestone formations, using their tentacles to search for food.
8. Horseshoe Crabs and Spiders
Horseshoe crabs were mistakenly classified as crabs centuries ago. While they do spend much of their time crawling along the sea floor and possess a horseshoe-shaped shell similar to that of a crab, they actually belong to the arachnid family.
Horseshoe crabs have existed for over 500 million years. These ancient survivors, who may not have evolved to thrive on land like their arachnid relatives, can grow as large as 0.6 meters (2 feet) wide. They use their long tails to dig for food or to flip themselves over if they happen to be upside down. Remarkably, horseshoe crabs possess 10 eyes located on their back and sides. They can regenerate lost body parts and even have blue blood, which is medically significant. This blue blood is used for detecting bacteria, in cancer research, diagnosing leukemia, and identifying vitamin B12 deficiencies. Unfortunately, many horseshoe crabs are captured for their blood or for use as bait.
7. Komodo Dragons and Allosaurus
No other lizard currently dominates the cool factor like the Komodo dragon. This massive reptile is intimidating, armed with toxic venom, and capable of hunting prey larger than itself. Now, imagine this 3-meter (10 ft) creature standing on its hind legs, sporting horns, and growing to the size of a dinosaur. Enter its distant cousin, the allosaurus.
A surprising shared trait between these two formidable predators is their surprisingly weak jaws for such large animals. The Komodo's biting strength is comparable to that of a house cat, and the fearsome allosaurus likely had to tear and strip flesh from its living prey instead of delivering bone-crushing bites. However, their delicate jaws were no hindrance when hunting, as evolution provided them with specialized skulls, powerful neck muscles, and sharp teeth designed for slashing. Essentially, they became lethal cutting machines.
Inertia eating, a method where prey succumbs to large wounds and blood loss, is a tactic also used by the Komodo dragon, which poisons its prey during bites. Recent studies revealed that the Komodo actually originated in Australia, not the Indonesian island of Komodo. It also has a mouth with remarkable flexibility, similar to that of a snake, which enables it to inflict devastating injuries across a larger area. Unfortunately for potential pet owners, neither the Komodo nor its dinosaur cousin, the allosaurus, are available for adoption. The dangers of keeping a Komodo ensure that dogs will remain the favored pets, and the allosaurus disappeared roughly 150 million years ago.
6. Meerkats and Civet Cats
Despite their similar names and impressive, cat-like agility, meerkats and civet cats aren't actually related to cats at all. These African carnivores belong to the mongoose and weasel family, known for their long, flexible bodies.
While both meerkat and civet mothers give birth in underground dens, their similarities end there. Meerkats believe in the power of community, as it takes a village to raise a pup. In contrast, civet cats are solitary mothers, only coming together with others during mating season. Civet babies are born fully furred and able to move, ready to face the world. Meerkat pups, however, are born naked and helpless, with no senses.
Meerkats, famous for standing on their hind legs to survey their surroundings, and known for their partial immunity to scorpion venom, are smaller and duller in color. The nocturnal civet, on the other hand, grows to more than three times the size of a meerkat, reaching 1.4 meters (4.6 ft). It has a striking appearance, with a bandit-like face mask and a beautiful jaguar-patterned coat, which unfortunately makes it a frequent target for hunters. Meerkats can live up to 13 years, while civets can live up to 20.
5. Ants and Bees
If bees were to attend a taxonomic family reunion, they wouldn’t be mingling with wasps but would instead be spending time with ants. Scientists reshuffled the family tree after sequencing the genetic material of these insects to solve an ancient mystery about their evolutionary origins. This newly discovered group, known as the aculeate (stinging) Hymenoptera clade, includes bees, ants, and stinging wasps. The research overturned the long-held belief that ants were more closely related to certain wasps and only distantly related to bees. The opposite was true, except for digger wasps and mud daubers.
This updated family tree gives entomologists the ability to study how reproduction, feeding habits, and social behaviors have evolved within this stinging group, and how they differ as distinct species. The revelation also solved the mystery of a fossil that had been hard to classify. The Cretaceous *Cariridris bipetiolata* had long been considered the oldest known fossilized ant, but with the new understanding of these insects’ evolutionary connections, it was reclassified as a type of ancient wasp.
4. Prawns and Woodlice
Woodlice are small, armadillo-like creatures that are sometimes kept as pets, but they are not actually bugs. These land-dwelling relatives of prawns and crabs number around 3,500 species, making them quite the successful crustaceans thriving on land. The only trait they share with insects is their tough exoskeleton and the 14 jointed limbs they possess.
These ‘penny pigs’ require constant moisture to survive, likely due to their aquatic ancestry. This is why they are commonly found in decaying plant matter. Most woodlice are herbivores, but some may occasionally snack on their own shed skin or excrement, or that of other shedding woodlice. Like other crustaceans, woodlice are edible and have been consumed alive by people who believe they help treat liver diseases. They also contain significant amounts of calcium carbonate, making them a rather unusual form of antacid when needed.
3. Humans and Kangaroos
Matilda, a small tammar wallaby, became the first kangaroo to have her genetic code mapped. Australian scientists were shocked when they compared her genome to that of a human. They had expected a large difference, but they found that the two species’ genomes were nearly identical, with many genes arranged in the same order. Both species share a vast amount of genetic information about each other.
The discovery that humans and kangaroos share a common ancestor dating back at least 150 million years added a new dimension to understanding evolution. In contrast, mice and humans diverged just 70 million years ago. This finding suggests that kangaroos might hold valuable insights into human evolution, particularly regarding why certain DNA sequences have remained unchanged over time, while others have evolved. By comparing the genomes of different species, previously unknown genes have been identified. For instance, Matilda, the kangaroo, revealed 14 new genes that had never been documented before, and these could potentially have equivalents in humans, waiting to offer us more clues about ourselves.
2. Gibel Carp and Koi Fish
Koi fish and goldfish, though distant cousins in the Cyprinidae family, can also mate, but like the union between horses and donkeys, their offspring will be sterile. These hybrids, while less vibrant than their colorful parents and lacking the characteristic mouth whiskers of true koi, are tougher and can thrive in harsher water conditions than either parent species.
Despite their genetic differences, koi fish and goldfish can crossbreed, but the result is a sterile offspring, much like the mule from horse and donkey parents. These hybrids are less visually striking than their koi and goldfish parents, lacking the iconic whiskers of the koi and exhibiting a duller color palette. However, they possess a greater resilience, able to endure more challenging water conditions than their more delicate relatives.
Recent studies have debunked the myth that goldfish have a memory span of only three seconds. In fact, goldfish can remember things for at least three months and are capable of recognizing various colors and sounds. These fish, which can live for decades, also possess the intelligence to learn simple tricks.
1. Dingoes and Indian Wolves
A landmark study conducted in Sydney revealed that dingoes are not the descendants of domestic dogs, nor are they a subspecies of them. In fact, they are an entirely distinct species. After being isolated for up to 5,000 years, dingoes evolved into a unique canid species. Despite their differences from domestic dogs, they share some common traits with wolves, such as living in packs, raising pups as a family unit, and having territorial howling. Interestingly, while the Indian wolf, to which dingoes are closely related, can howl, it rarely does, and scientists have yet to uncover the reason behind this behavior.
The study from Sydney confirmed that dingoes are not connected to domestic dogs in any way. They are a separate species altogether, genetically distinct from dogs. What is fascinating, however, is that dingoes share pack dynamics with wolves, including annual pup births and cooperative rearing. They also engage in territorial howling, a behavior characteristic of wolves, although it is worth noting that the Indian wolf, their close relative, almost never howls, despite being physically capable of doing so. The cause of this unusual behavior remains unknown.
