টাইরেননোসরাস রেক্স, “ট্যারান্ট লিজার্ড কিং” বা সংক্ষেপে টি. রেক্স, ক্রাইটিসিয়াস যুগে প্রায় ৭০ থেকে ৬৫ মিলিয়ন বছর আগে পৃথিবীতে বসবাস করত এমন একটি ডাইনোসর ছিল। টি. রেক্স হলো এখন পর্যন্ত আবিষ্কৃত সবচেয়ে বড় মাংসাশী ডাইনোসর। এটি বেশিরভাগ ক্ষেত্রেই সর্বাধিক পরিচিত ডাইনোসর।
তাদের দেহের আকারটি কী ছিল? সম্পাদনা
টাইরনোসরাস রেক্সটি ১৩ মিটার (৪২ ফুট) লম্বা এবং ৪ মিটার (১৩ ফুট) পর্যন্ত লম্বা ছিল এবং ওজন ৪ থেকে ৬ টন (৮,৮২০ পাউন্ড থেকে ১৩,২২০ পাউন্ড) - বাসের চেয়ে দীর্ঘ এবং হাতির মতো ভারী। এটি একটি প্রাপ্তবয়স্ক হিসাবে। টি রেক্স যখন প্রথম উত্থাপিত হয়েছিল তখন সম্ভবত টার্কির আকার সম্পর্কে ছিল। টি. রেক্সের একটি সামনের দিকে ঢালু, গভীর চোয়াল, বিশাল দাঁত, একটি দীর্ঘ লেজ এবং ছোট বাহু ছিল (ফোরেলিম্বস নামেও পরিচিত)।
T. rex's jaw alone was about 1.3 meters long and had fifty to sixty bone-crunching teeth that were up to 10 centimeters or 6 inches long. Its arms were very stubby, no longer than an average person's. They were still very strong, able to lift up to two hundred kilograms, but were not long enough to touch each other! T. rex stood on two powerful hind legs, each ending with a three-toed foot, resembling a bird's foot, only much larger.
What did they eat? সম্পাদনা
T. rex was a very big meat-eating dinosaur, also called a carnivore. It would have been at the top of the food chain. It is known to have fed on other large dinosaurs, such as Edmontosaurus, Anatosaurus, and Triceratops, and probably could have swallowed smaller dinosaurs in a single bite.
One scientist believes that T. rex was a scavenger (an animal that eats already dead animals). He argues that it might not have been fast enough to catch prey. Other scientists believe that T. rex probably scavenged and hunted, like most living meat-eaters (such as tigers and lions). T. rex bite marks found on the bones of Edmontosaurus and Triceratops that have healed show that Tyrannosaurus did hunt at least some of the time – and also that its prey was sometimes lucky enough to escape.
One thing that T. rex did not eat was people. People didn't appear on Earth until over 60 million years later, much too late for anyone ever to be afraid of being hunted down by a T. rex.
When did they live? সম্পাদনা
Tyrannosaurus lived about 70 to 65 million years ago, in the late Cretaceous Period. T. rex was among the last of the big dinosaurs. Like all non-bird dinosaurs, T. rex lived in the Mesozoic era.
What was their habitat? সম্পাদনা
Tyrannosaurus is believed to have lived in forests, near rivers, and in areas that were open and full of prey. Mild seasons would have been most favorable to it. Tyrannosaurus fossils have been found in western North America and possibly Asia.
How were they discovered? সম্পাদনা
The famous fossil hunter Barnum Brown found the first Tyrannosaurus fossil in 1905. Tyrannosaurus was not the dinosaur's name until 1905, when it was given that name by Henry Fairfield Osborn. About 3,000 Tyrannosaurus fossils have been found, from pieces of teeth to nearly complete skeletons. Only one possible Tyrannosaurus footprint has been found.
What do we need to learn? সম্পাদনা
- The color of their skin. One thing we cannot tell from fossils is color!
- Whether T. rex was feathered, scaly, or both. Some of its cousins had feathers like birds, while others had scales, so it likely had both.
- Whether T. rex was just a scavenger or a scavenger and a hunter. There are very few hunting animals that will not scavenge, and very few scavengers which never hunt.
- If T. rex had the ability to run.
- Was it really the largest predator? In 1995, parts of a predator that seems even larger than T. rex were found in Argentina! It was called Giganotosaurus and was about 45 ft long (about a meter [yard] longer than T. rex). Since then, parts of even larger carnivorous dinosaurs, such as Spinosaurus and Carcharodontosaurus, have been found.