But recently, paleontologists have had to change this view and push the herbivorous history of dinosaurs to the early Cretaceous period, 125 million years ago, grasses began to appear. This was discovered during the study of fossils of the dinosaur Equijubus found in China. Mount Mazong is located at the northern end of the Hexi Corridor, in present-day Gansu Province, China. The mountain is named because it looks like a horse’s mane blowing in the wind. Mazong Mountain is a desolate place, but beneath that gravel are the remains of creatures that died hundreds of millions of years ago. In 2000, paleontologists from China and the United States formed a joint expedition to unearth paleontological fossils in the Mazong mountain area. During this excavation, paleontologists discovered a large number of fossils. Chinese paleontologist You – Hailu studied the fossils of a new dinosaur species and he named this dinosaur Equijubus. The genus name is derived from the Latin words “equus” meaning “horse” and “juba” meaning “mane”, the genus name meaning “horse mane” because the fossil was found in Mount Mazong. The new species was given the full name Equijubus normani, with “Normani” being named in honor of the famous British paleontologist David B. Norman. Illustration. Equijubus can be considered an intermediate dinosaur between Iguanodon and Hasrosauridae. Equijubus has a fairly large body when compared to a “basic” Hasrosauridae, but they can still run on two legs after being chased by predators. Fossil specimens of this dinosaur include skulls, lower jaw bones, cervical vertebrae, dorsal vertebrae and other parts. Through fossil analysis, it can be seen that Equijubus belongs to the primitive Hadrosauridae, it already possesses some features of Hadrosauridae, but its skull also has obvious features of Iguanodon. Paleontologists surmise that the dinosaur Equijubus could be up to 7 m long, 2 m high and weigh 2.5 tons, almost the size of a small truck. Equijubus would have had a long head, a horn beak on the front of its mouth and flat teeth on the inside of its cheeks, allowing it to chew on hard plants. Equijubus also have a robust body, they often walk on all fours and run on two legs when fleeing predators. Although there are not many fossils of this species, the discovery of Equijubus has great significance for paleontology. As a very primitive Hadrosauridae, Equijubus has shown that the Hasrosauridae may have originated in Asia and that they evolved directly from Iguanodon. 14 years after the Equijubus species was named, paleontologists are once again studying their fossils using the latest technology. They found evidence of herbivorous dinosaurs actually eating grass in fossils! On December 21, 2017, You Hailu and other paleontologists published a research paper titled “Dinosaur-related cuticles and crystals from the Chinese Gramineae family of the Cretaceous Period” on National Science Journal of China. The paper mentioned that the microstructure of primitive herbaceous plants (herbs, rice) was silicified between the teeth of the dinosaur Equijubus. This suggests that herbaceous plants were originally the food of this dinosaur. In fact, to answer the question of whether or not herbivorous dinosaurs ate grass, we need to know that the grass family is a large family of plants with more than 650 genera. Rice, wheat, corn, millet, sorghum, etc… the plants that we cannot live without are all grasses, and many other plants that we can eat are also grasses. People have always doubted the existence of the grass family, and the time period of its appearance is also quite unclear. And in the past, scientists always thought that they appeared after dinosaurs. But through the discovery of secrets from the fossils of the dinosaur Equijubus, we have learned that grass appeared on Earth 125 million years ago. This means that on Earth, dinosaurs of that time also had herbivorous habits (literally eating grass). The earliest known seed-bearing plants can be traced back to the Middle Jurassic or earlier, 164 million years ago. It was discovered during the Boda Jurassic period in Inner Mongolia. Although this plant is only a few centimeters tall, it already has roots, stems, leaves, and fruits.

Wild mustangs in the US are of Spanish origin. According to the American Museum of Natural History (AMNH), mustangs are not wild horses because they come from a domesticated population, and therefore, wild mustangs are considered wild. They can be found freely throughout the western United States but are kept and ridden by humans like other horses. According to Horse Canada, a government-run horse website, the Mustang has a muscular body and hard hooves, which makes them suitable for scouting and horseback riding. Equus horses, evolved in North America about 4 million years ago, before spreading to the rest of the world. The last real American wild horses died about 10,000 years ago, possibly due to climate change and human interactions. Characteristics of Mustang Mustangs, like other horses, are usually measured by hand, typically 14 to 15 arm span tall. This is equivalent to 56 inches to 60 inches (140 to 150 cm). They weigh about 360 kg. Mustangs can be available in a variety of colors. Usually, they are reddish brown, or sorrel, chestnut in color. They can also have multiple patches, spots, and stripes. Mustang lives in the grasslands of the western United States and mainly feeds on grasses and palms. The US Land Administration oversees “wild” horse and burro populations, and allows them to run freely on 10.9 million hectares of public land. The range is divided into 10 herd management zones: Colorado, Nevada, Arizona, California, Idaho, Montana-Dakotas, New Mexico, Oregon-Washington, Utah and Wyoming. According to Smithsonian Magazine, wild horses also live on the Atlantic coast and on islands such as the Sable Islands, Shackleford and Assateague. Mustangs live in herds. According to the Humane Society, a herd consists of a stallion and about eight females and calves, although separate herds have been known to mix when they are in danger. Each herd is led by a mare or mare and a stallion over 6 years old. In dangerous situations, the dominant mare will lead the herd to a safe place, the stallion staying to fight. Like other mammals, the mare is 11 months pregnant and usually born in April, May or early June. This gives foals time to grow before the cold months of the year. Horses typically live for 25 to 30 years in captivity, although some live up to the age of 40. Horses that live in the wild, like wild populations in public lands in the western United States, generally have a shorter lifespan, although they have been reported to live up to 36 years. There are many types of mustangs? Horses originally introduced by the Spanish into North America bred with other domestic horses for many years and, therefore, Mustangs are often a mix of several different breeds. These breeds include draft horses and purebred horses. Mustangs bred between different populations and some more closely resembled their Hispanic ancestors than others. For example, Oregon Kiger mustangs live in small, isolated herds and their bloodline is largely derived from early Spanish horses. Mustangs are known for their wild nature, but they can be domesticated and rode like other horses. However, this process will take longer if they are obtained directly from the wild – rather than in captivity – and they are not used to being handled by villagers. The number of mustangs declined dramatically in the 20th century due to horses being killed and captured for a variety of reasons, including for human and dog food. America in 1900; According to AMNH, by 1971, the number of mustangs had decreased to 17,300. The Mustang was later secured on public lands, along with burros. The US Congress declared the mustang “a living symbol of the historic spirit and pioneer of the West.” This Act also allows them to be regulated and controlled. The US Land Administration controls mustang and burro counts on public lands. The process is controversial and several wildlife protection groups. Without human intervention, mustang populations can rapidly increase because not many predators, such as wolves, can naturally control them, according to AMNH.