Alphabetical List of Animals That Start with X
what animal starts with a x
|X-Ray Tetra||Xeme (Sabine’s Gull)||Xenacanthus|
|Xingu River Ray||Xiongguanlong||Xiphactinus|
The X-Ray Tetra is a tiny schooling fish that lives in the Amazon River’s coastal waters in South America. Because of the light golden hue of its transparent skin, the X-Ray Tetra fish is also known as the Golden Pristella Tetra and the Water Goldfinch.
Scientific Name and Classification
Albert Ulrey described the X-Ray tetra in 1894, and it has since become one of the most popular freshwater species maintained in tanks today. Despite being the only known species in its genus, the X-Ray tetra (Pristella maxillaris) is closely related to other tiny and colourful South American fish, including around 150 other tetra species. Among the other tetra kinds are:
The X-Ray Tetra fish’s greatest distinguishing characteristic is the transparent covering of skin that covers its tiny body, allowing the fish’s backbone to be easily seen. The X-Ray Tetra’s scales have a silvery-yellowish colour that appears nearly golden in various circumstances. The X-Ray Tetra possesses a red-tipped tail as well as vividly striped dorsal and anal fins in yellow, black, and white. This is a tiny species of fish (1.5 inches) with a bony internal structure called the Weberian apparatus that is utilized to take up sound waves and adds to the X-Ray fish’s acute sense of hearing (this bony structure is also found in many of its cousins). Females are typically Although they seem extremely identical, men are somewhat bigger and rounder than females.
The Amazonian coastal waters of Brazil, Guyana, and Venezuela are home to the X-Ray Tetra. They vary substantially from other Tetra species in that they can endure both harsh brackish water along the shore and their regular freshwater settings. During the dry season, they live in clear-water streams and tributaries, but when the rains come, the X Ray fish migrate to flooded marshlands, where the water is softer and more acidic. The X-Ray Tetra breeds during the wet season because there are better water conditions and a greater supply of food.
Xeme (Sabine’s Gull)
The Xeme (Sabine’s gull) is a tiny gull that is native to North America and Europe. During the mating season, it dwells in the Arctic, migrates across oceans, and spends the winter in more tropical regions. This bird is frequently seen flying low over the sea and hunting for insects and fish in small ponds and tidal flats. This sociable species mates for life and spends the most of its time in flocks. Learn all you can about the Xeme, such as where to locate it, what it eats, and how it acts.
5 Amazing Xeme Facts
Xeme spends the most of the year on Arctic tundra, where they mate and build their nests.
They pursue seals and whales to devour their leftovers.
Occasionally, groups congregate to perform demonstrations and emit their squeaky high-pitched sounds.
Their offspring are born advanced and can feed themselves immediately after hatching.
They may raid other birds’ nests in order to consume their young.
Where to Find Xeme
The Xeme may be found in over 25 nations across North America and Europe, including Iceland, Greenland, Canada, Russia, and Germany. They spend the spring and summer in the high arctic, move across oceans, and spend the winter in milder seas along coasts. During the mating season, they live in the Arctic tundra and spend the summers on marshy tundra near the coast, particularly in areas with numerous ponds and tidal flats. This bird spends most of its migration and winter at sea, only a few miles offshore.
The Xenacanthus was a tiny freshwater shark that became extinct around 200 million years ago. They are an ancient shark genus. It became extinct at 202 million years ago, near the end of the Triassic epoch. They existed from the Devonian to the end of the Triassic epoch and were extensively spread. The term Xenacanthus is derived from the Greek word meaning “foreign spine.” There have been very few complete fossils discovered. The majority of the animal’s information has come from tooth and spine samples. A freshwater shark, the Xenacanthus.
The name Xenacanthus is derived from the Greek terms xénos, which means “foreign” or “alien,” and akanthos, which means “spine.” Their fossils and tiny samples have been discovered in freshwaters all over the world. These fish first appeared during the Devonian period, sometimes known as “the Age of the Fish.” During this time, fish jaws grew and developed. Scientists think that they eventually developed into amphibians capable of living in semi-aquatic conditions.
Description & Size
When compared to modern sharks, the characteristics of Xenacanthus were highly unique. They ranged in length from 3 to 5 feet, with a maximum length of 6 feet. So, around the length of a 10-year-old child. Their dorsal fin was lengthy and stretched down their backs and tails before merging with the anal fin. As a result, they resembled modern-day eels rather than sharks. They are also said to swim in a manner similar to conger eels. Furthermore, the Xenacanthus possessed a substantial dorsal spine that stretched from behind its head. The spine expanded outwards and could be as much as a foot long at times, earning it the names xénos, which means “foreign” or “alien,” and akanthos, which means “spine.”
Unlike the majority of fish and sharks,The spine was constructed from bone and cartilage in their backs. This spine developed annulated rings around it, which scientists used to determine the animal’s age. Female Xenacanthus spines were longer than males’, and it is thought the spines held poison, which the Xenacanthus would employ to protect itself. They have special “V-shaped” teeth that allowed them to eat tiny crustaceans and other fish. Their bodies were thin and elongated, having fins on the bottom. They lacked the typical shark morphology. Instead, their bodies resembled those of today’s stingrays and eels.
Xenoceratops was a two-ton herbivorous dinosaur that lived in present-day Canada around 80 million years ago during the Late Cretaceous period. This makes it Canada’s oldest known large-bodied, horned dinosaur. It is also one of North America’s oldest. Despite the fact that only fragments of this dinosaur’s anatomy have been preserved in fossil records, scientists have learnt a lot about the evolution of horned dinosaurs by researching the Xenoceratops.
Description and Size
Xenoceratops was a centrosaurine ceratopsid dinosaur genus that lived around 80 million years ago. It belongs to the ceratopsian dinosaur family. This family’s members are all quadrupedal herbivores. Triceratops and Styracosaurus are also members of the group. For a while, experts believed this dinosaur was related to the Triceratops. Recent discoveries, however, have proved that this is incorrect. They are, nonetheless, connected because they are from the same family.
Only one species of Xenoceratops is known: Xenoceratops foremostensis. The species name translates as “alien horned face,” referring to the two odd-looking large brow horns above its eyes and a large shield at the rear of its head. It’s also possible that the term referred to the rarity of the fossils since finds from this section of the fossil record were uncommon. The specific name foremostensis relates to the Village of Foremost, where the dinosaur was discovered for the first time.
This dinosaur was roughly the size of a rhinoceros, measuring 19.6 feet long and weighing more than 2 tonnes (4,000 pounds). It was also around seven feet tall. Despite its size, the Xenoceratops was the largest ceratopsid alive 80 million years ago.
This dinosaur, like other ceratopsids, had bony frills on its skull. The ornamentation of the Xenoceratops’ frills, however, was distinct from that of other members of its family. Near the frill’s midline, there were two knob-like bony projections. There was also a single straight spike close to these knobs, as well as a huge triangular knob on the parietal’s anterior corners.
Discoveries and Fossils—Where Xenoceratops was Found
The Xenoceratops was one of the rare dinosaur fossils discovered in southern Alberta. The majority of Alberta’s other dinosaurs resided further north. To far, just one species of Xenoceratops has been discovered. This dinosaur’s description was based on skull pieces from at least three individuals. All of the fossils were discovered near the town of Foremost, Alberta, Canada, in the Foremost Formation. Wann Langston, Jr. unearthed the Formation skull pieces in 1958. He did not, however, analyse or characterise the fossil for several decades. It was instead kept in cabinets at the Canadian Museum of Nature in Ottawa.
David C. Evans and Michael J. Ryan discovered the specimens in 2003 and chose to research them. They discovered that it belonged to In 2012, a new species and genus were discovered, and a detailed description was published.
Xenoceratops foremostensis is the oldest ceratopsid dinosaur found in Canada. Moreover, despite the fact that other dinosaur fossils have been discovered in the Foremost Formation, the Xenoceratops is the first to be characterised.
Xenoposeidon is a genus of extinct sauropod dinosaurs that existed roughly 130 million years ago during the Early Cretaceous Period.
The sole known fossil xenoposeidon specimen is a single neck vertebra unearthed in the United Kingdom in 2002.
The vertebra contains tiny, round holes on its surface that might have housed air sacs to assist lighten the bones while still supporting the weight of the animal’s head and neck.
“Xenoposeidon” means “strange poseidon.” Palaeontologists picked it because of the distinctive form and holes in the neck vertebra.
Sauropods such as xenoposeidon are assumed to have served a vital ecological purpose by removing plants from the forest floor to the canopy and distributing seeds through their faeces to establish new trees.
Description & Size
Because the sole xenoposeidon specimen identified so far is a neck vertebra, palaeontologists must make assumptions about its size, appearance, and behaviour based on parallels to other sauropod dinosaurs. Based on this, xenoposeidon had a body length of roughly 30-50 feet, a shoulder height of 15-20 feet, and a weight of several tonnes. This is approximately the size of a lorry trailer that you would see on the highway. In comparison, some sauropod species grew to be 100 feet long and 100 tonnes in weight. As a result, xenoposeidon would be a sauropod of modest size.
To maintain their gigantic bodies, sauropods like xenoposeidon had tiny heads, long necks, whip-like tails, and stood on four legs the size of tree trunks.They were not built for speed and most likely walked with a long, lumbering stride. They may have walked at a speed of 5-10 miles per hour. This is equivalent to the speed at which an average healthy person today may progress from jogging to fast running. You shouldn’t be complacent if you want to race with one. Sauropods may have been able to run far faster in short sprints, and they may have physically tossed their weight about to throw enemies off balance.
Threats And Predators
In general, sauropods are assumed to have been too huge and well-defended to be attacked by most predators, and they most likely had few natural adversaries. Individuals who were young, sick, or injured, on the other hand, would have been preyed upon. And because xenoposeidon was not the biggest sauropod, it may have been in greater risk than some of its larger relatives. When unable to flee danger, sauropods may have utilised their massive body weight as a defence by attacking opponents and using their tails as devastating whips or clubs. It’s also likely that they’ll stand on their rear legs to seem taller and more frightening, then stomp with their big front legs and feet.
The spinosaurid carnivores would have posed the biggest predatory danger to xenoposeidon. Ceratosuchops inferodios, Riparovenator milnerae, and the baryonyx were discovered close and would have existed at the same period. Each of them would have been roughly 30 feet long, about the size of a xenoposeidon. They have crocodile-like jaws and were accustomed to hunting both on land and in the water.
Other important risks to xenoposeidon, like with other dinosaurs, may have included climate change, illness, and the loss of evolutionary advantages when new species arose that were better fitted to take over its position in the environment.
The Xerus, sometimes known as the African ground squirrel, is a species endemic to Africa. These animals are generally herbivorous and diurnal. They are exceedingly gregarious and, like their cousins the marmots and prairie dogs, live in burrows.
5 Amazing Facts
Mature male Xerus like to create their own groups apart from the ladies. These groups are typically made up of roughly 20 people. Female Xerus dwell in groups of one to four with their young, which are also known as pups.
These squirrels, unlike other squirrels, are not known to hide food. Instead, they go out looking for food every day and do not preserve consistent storage.
They do not reside in trees, preferring to live in burrows in the desert.
These squirrels mate all year rather than just during the breeding season. Both men and females have several mating partners.
Appearance and Behavior
From head to toe, these squirrels are clothed in coarse, short hair that is frequently the light-brownish colour of the earth. It can, however, be seen with reddish-grey or yellowish-grey fur. Their feet are hairless compared to the rest of their body. While their foot pads have little to no hair, the foot itself has some. These squirrels have the ability to jump up to 20 feet. They have large, robust rear legs and small front legs that let them leap. The striped ground squirrel’s body features a white stripe going down both sides and shoulders. The tail is typically flat and darker in colour than the body hair. The animals’ ears Animals are typically tiny, with long, curled claws. These claws, however, do not allow the species to climb trees.The squirrel’s height, excluding the tail, can range from 17 to 18 inches. The tail is typically 7.5 to 10.2 inches long, accounting for almost one-third of the Xerus’ total length. These squirrels use their tails to shelter themselves from the blazing sun.
The size of the squirrel is primarily determined on the subspecies in question, since all four might vary. They typically weigh 14 ounces.
The Xerus is a gregarious animal that prefers to dwell in groups. A group typically comprises of 1-3 females and 2 to 3 males. Surprisingly, adult guys prefer to create their own bigger groupings.Each group can have up to 20 members. Females, on the other hand, live in groups of 1-4 with their children.
The Xerus is known to inhabit open habitats, including forest, desert, and grassland. One of the subspecies can even be found in stony areas such as mountains. While many other squirrels and related species are known to dwell on trees, Xerus prefer to live in burrows. Although Xerus may be found across Africa, the greatest places to see some of these creatures in the wild are in the deserts of South Africa, Namibia, Lesotho, and Botswana. Because squirrels do not migrate, the chances of spotting one are pretty good.
Birds are the closest approach to dinosaurs that we can discover. While T. rex and other large dinosaurs look nothing like contemporary birds, smaller dinosaurs like the Xiaotingia seem more like their descendants. This genus of bird-like theropod dinosaurs, pronounced “zhow-tin-gee-ah,” existed in western Liaoning, China, during the middle to late Jurassic Period.
Description and Size
The Xiaotingia are a genus of prehistoric dinosaurs that lived in what is now China during the Late Jurassic period. There is just one species known, Xiaotingia zhengi. The general and specific names of this dinosaur honour palaeontologist Zheng Xiaoting.
The Xiaotingia was a prehistoric dinosaur that was rather tiny. It was comparable in size and structure to the well-known Archaeopteryx. Xiaotingia would be almost the same size as modern pigeons or hens, with an average length of about 23.6 inches (60 cm) and a weight of 1.8 pounds (0.8 kg).
Like birds, the majority of this dinosaur’s body was covered with feathers, particularly the head, forelimbs, hindlimbs, and neck. The feathers measured up to 2.16 inches in length. The dinosaur’s tibia and metatarsus also had long pennaceous feathers. Experts believe this dinosaur was capable of short-distance flight, utilising its hindlimbs as a form of wing, because to the quantity of long feathers.
Xiaotingia’s femur was long and her humerus was short. This suggests they had longer forelimbs than hindlimbs. They were bipedal, standing and walking only on their hind limbs. Experts believe they had forelimbs similar to contemporary birds and utilised them for flapping. The femur of Xiaotingia was covered in lengthy feathers. They had less than ten teeth in their mouth a dentary formula comparable to that of primitive birds.
Diet — What Did Xiaotingia Eat?
Scientists think that modern birds are deinonychosaurs’ ancestors. This group of Jurassic Period dinosaurs ate mostly carnivorous plants. Because Xiaotingia was connected to them, they were most likely carnivorous as well. The majority of this dinosaur’s diet would have consisted of insects.
Habitat — When and Where It Lived
Xiaotingia existed in the western Liaoning area of China from the Middle Jurassic to the Late Jurassic periods. This dinosaur lived a partially terrestrial and partly arboreal lifestyle, which means it spent a lot of time in trees. There is no indication that they could fly vast distances, suggesting that they would have chosen shorter trees to higher ones.
Threats and Predators
Xiaotingia was a tiny dinosaur with no obvious defence mechanisms. Xiaotingia lives in trees to protect its eggs and avoid predators. This would have made it impossible for the predatory, land-dwelling dinosaurs to get it. Furthermore, the dinosaur’s ability to fly over short distances using its limbs as wings suggests that it was able to dodge some predators. As a result, it was a relatively easy prey item for larger predator dinosaurs living at the same period.
A rare bird found only in Baja California, Mexico, is the Xantus in gbird. The majority of them are green birds with black cheeks.
Behind their eyes, they feature a noticeable white stripe. The birds of the Xantus are nectar-loving creatures with harsh, metallic calls.
Fun fact: The hummingbirds of the Xantus only reach a length of 9 cm.
The Xanthippe’s shrew is a mole with rodent-like characteristics. It is indigenous to Eastern Africa, specifically Kenya and Tanzania. They consume both plants and other small animals like worms, slugs, and snails since they are omnivores.
Fun fact: Three weeks after birth, the shrews’ young become independent.