Tyrannosaurus Rex a.ok.a T-Rex is among the most well-known species of dinosaurs on this planet. Humongous, ferocious, lethal and terrifying are some phrases which might be generally used to explain them. This species is estimated to stay throughout the Higher Cretaceous Period, which is the ultimate period the place dinosaurs reigned supreme. If that’s the case, then how did they appear to be throughout earlier instances once they had been removed from the highest of the meals chain?
However, to grasp the reply to this query, we have to perceive how the species got here to be. T-Rex belongs to the household Tyrannosauridae which is a household that may be a descendant of the household Tyrannosauroidae. Surprisingly, the ancestors of the Tyrannosaurus did not share their dimension. These Tyrannosauroids are very small in comparison with the T-Rex. One of many member of the household is the Dilong. This species which was present in China is estimated to have a most size of round 2m when it’s totally grown. You’ll in all probability suppose that it’s not possible for this species to be the ancestor of the big T-Rex. However, it is true. There’s a motive why these small predators turned the apex predator of their time.
Scientists predict that the local weather throughout the Cretaceous was heat identical to immediately’s tropical local weather. This local weather helps development of vegetation to excessive sizes. This meant bother to the small herbivores. If their meals sources grew so excessive, then how had been they supposed to achieve them? Their reply? Develop larger our bodies and longer necks. This evolution idea is confirmed by the invention of big herbivore fossils all around the world. One of many largest recognized dinosaurs, the Titanosaur is estimated to develop as tall as 20m (65 ft).
How does this relate to the rise in dimension of carnivores? As they develop larger it additionally implies that they grew stronger and more durable to prey on. This precipitated issues for carnivores at the moment as a result of most carnivores on the time depends on their pace as a substitute of dimension or power superiority. To beat this drawback, they adopted what their prey did. That is additionally what occurred to the Tyrannosauroidae household. They grew from predators in regards to the dimension of a Nice Dane into constructing sized predators.
Throughout this time, many of the evolution that occurred to this household was a change of dimension. After all, they did not turn out to be the highest of the meals chains merely due to their dimension. However, different options that made them the apex predator of their time already existed on their ancestors. Which implies that although they had been separated by thousands and thousands of years, the small Dilong and the big T-Rex have kind of the identical physique construction.
That was the rationale that the T-Rex may turn out to be the apex predator of its time. However, their dimension can also be one of many causes that led to their extinction with different dinosaurs. So, you may resolve your self whether or not the T-Rex’s gigantic physique is a blessing or a curse.