Definition: A type of spider, which belongs to the family Araneidae, known for their ability to spin webs.

Example: The araneid spun a beautiful web in the corner of the garden.

Definition: A large fish found in freshwater rivers in South America, known for its size and is often used as food.

Example: The arapaima is one of the largest freshwater fish in the world, reaching lengths of up to 3 meters.

Definition: Relating to or living in trees.

Example: Many species of birds are arboreal, spending most of their time in the treetops.

Definition: A long-extinct bird from the Jurassic period that had features of both birds and reptiles, such as feathers, teeth, and a bony tail.

Example: The archaeopteryx is often considered a key species in the study of evolution between dinosaurs and modern birds.

Definition: A type of fish that can shoot water from its mouth to knock insects off branches and into the water to eat them.

Example: The archerfish is known for its unique ability to shoot water at insects above the water's surface.

Definition: A type of reptile that belongs to a group including dinosaurs, pterosaurs, and crocodiles.

Example: The archosaur is an important part of the evolutionary history of reptiles.

Definition: A member of a group of reptiles that includes dinosaurs, crocodiles, and birds, characterized by certain skeletal features.

Example: The archosaurian lineage includes some of the most fascinating creatures in Earth's history.

Definition: Describing organisms that grow, live, or burrow in sandy environments.

Example: The arenicolous species of worms thrive in coastal sand dunes.

Definition: A type of bird known as the adjutant bird, often found in wetlands and known for its large size and distinctive appearance.

Example: The argala is often seen near rivers and marshes, where it searches for food.

Definition: A large wild sheep found in the mountains of central and northern Asia, known for its impressive spirally curved horns.

Example: The argali is known for its ability to navigate steep mountain terrains.