**Arrhinoceratops: A Unique Dinosaur** Arrhinoceratops is a type of dinosaur that lived about 70 million years ago during the Late Cretaceous period. Its name means “no nose-horn face.” This dinosaur belonged to a group called ceratopsians, known for their beaked mouths and often large horns. **Discovery and Classification** Arrhinoceratops was first described by a scientist …

Arkharavia is a name given to a type of dinosaur that lived a long time ago, specifically during the Late Cretaceous period, around 66 million years ago. This dinosaur was first discovered in Russia and was named in 2010 by scientists Alifanov and Bolotsky. The name Arkharavia comes from the “Arkhara road.” The main remains …

**Arkansaurus: The Arkansas Dinosaur** Arkansaurus is an extinct type of dinosaur that lived during the Early Cretaceous period, specifically in the Aptian to Albian stages. Its name means “Arkansas lizard.” The only known species of this dinosaur is Arkansaurus fridayi. **Discovery Story** In August 1972, a man named Joe B. Friday, who owned a service …

Arizonasaurus is a fascinating dinosaur-like reptile that lived around 243 million years ago during the Middle Triassic period. The name “Arizonasaurus” means “Arizona reptile” because it was found in Arizona, specifically in the Moenkopi Formation. This creature is part of a group called ctenosauriscids and is known for its unique feature: a large sail on …

Aristosuchus is a prehistoric dinosaur that lived around 125 million years ago during the Early Cretaceous period. It was a small, meat-eating dinosaur that belonged to a group called theropods, which are known for being bipedal, meaning they walked on two legs. The name Aristosuchus comes from the Greek words for best and a crocodile-headed …

Aristosaurus is a lesser-known type of dinosaur that lived in South Africa during the Early Jurassic period, around 192.9 to 174.7 million years ago. The only species of this dinosaur is called Aristosaurus erectus. It was named in 1920 by a scientist named Egbert Cornelis Nicolaas van Hoepen, who discovered a nearly complete skeleton while …

Argyrosaurus is a type of dinosaur known as a titanosaurian sauropod. These dinosaurs were plant-eaters and lived in the Late Cretaceous period, about 70 million years ago in what is now Argentina. **Discovery and Naming** Argyrosaurus was first described by a scientist named Richard Lydekker in 1893. The main fossil that helped scientists understand this …

**Argentinosaurus: The Giant Dinosaur** Argentinosaurus is a huge dinosaur that lived during the Late Cretaceous period, around 96 to 92 million years ago, in what is now Argentina. This dinosaur is part of a group called sauropods, which are known for their long necks and large size. **What Makes Argentinosaurus Special?** Argentinosaurus is considered one …

Arenysaurus is a type of dinosaur that lived a long time ago, about 66 million years ago, during the Late Cretaceous period. It is part of a group called hadrosaurs, known for their unique features, including hollow head crests. Arenysaurus is one of the last non-bird dinosaurs and disappeared around the time of a major …

**Ardetosaurus: A Unique Dinosaur from the Past** Ardetosaurus is an extinct dinosaur that lived during the Late Jurassic period, about 150 million years ago. This dinosaur was part of a group called sauropods, known for their long necks and tails. Specifically, Ardetosaurus is a member of the Diplodocidae family, which includes other famous giant dinosaurs …