What is the Closest Living Relative of T-Rex?

The Tyrannosaurus Rex, often referred to as the T-Rex, is one of the most well-known dinosaurs. This gigantic predator roamed the earth millions of years ago, but have you ever wondered about the closest living relative to T-Rex? The answer might surprise you!

When we think about the closest living relative to dinosaurs, we often imagine a creature that resembles them in size and ferocity. However, the truth is quite different. The closest living relative to the T-Rex is not a reptile or another large creature, but a bird. Yes, you read that right. Birds are the closest relatives to these ancient beasts.

The Bird-Dinosaur Connection

Modern birds are descendants of a group of two-legged dinosaurs known as theropods, the members of which include the powerful predator T-Rex and the smaller velociraptors. So, when we discuss the T-Rex’s closest living relative, we’re essentially talking about birds, particularly the chicken and the ostrich.

Chickens: Descendants of T-Rex

It may seem unbelievable, but chickens are considered direct descendants of the T-Rex. Scientists found this connection by comparing proteins from a T-Rex fossil with a wide range of living animals. They discovered that the T-Rex protein had the highest similarity to the protein from chickens. This makes the humble chicken the closest living relative to the T-Rex.

Ostriches: A Close Second

While chickens hold the title for being the closest relatives, ostriches are not far behind. When comparing the ostrich skeleton vs T-Rex, there are striking similarities. Both have hollow, pneumatic bones, a feature unique to birds and theropod dinosaurs. The similar bone structure suggests a common ancestry.

T-Rex and Birds: More Alike Than You Think

The idea that birds are the closest relatives to dinosaurs like the T-Rex might seem strange at first. However, when you delve into their characteristics, it becomes clear why this is the case. The similarities between these two groups go beyond just DNA and bone structure.


Many theropods, including the ancestors of the T-Rex, had feathers. While the T-Rex itself may not have been feathered, it’s likely that it carried the genes for feather production.

Brooding Behavior

The T-Rex and other theropods have been found in what appears to be nesting positions, suggesting that they brooded their eggs, much like birds do today.

Similar Lungs

Birds have a unique respiratory system, unlike any other group of animals. Interestingly, evidence suggests that dinosaurs like the T-Rex had a similar respiratory system.


So, the next time you see a chicken pecking at the ground or an ostrich sprinting across a field, remember that they’re the closest things we have to a dinosaur alive today. They may not look as intimidating as their ancient ancestor, the T-Rex, but they carry a piece of our planet’s prehistoric past within them. And who knows? By studying these birds, we might uncover more about the T-Rex and its dinosaur relatives.

So, to answer the question, “What is the closest living relative to the Tyrannosaurus Rex?“, it’s the chicken and the ostrich. They are the closest living relatives to the T-Rex, serving as a testament to the enduring legacy of dinosaurs.

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