Definition: A type of feather found on the wings of birds, specifically the longer feathers that are located closer to the body and help with flight.

Example: The bird spread its wings, showcasing its beautiful tertial feathers.

Definition: A protective formation used by ancient Roman soldiers, where shields are arranged in an overlapping manner to shield the soldiers from enemy attacks.

Example: The soldiers advanced under the testudo formation to protect themselves from arrows.

Definition: Describing an organism that has four limbs or leg-like structures.

Example: The tetrapod animals include frogs, birds, and mammals.

Definition: A type of animal that has four limbs or legs, including creatures like amphibians, birds, and mammals.

Example: Frogs are examples of tetrapods that live both in water and on land.

Definition: Referring to a type of animal whose teeth are set in sockets in the jaw, similar to how modern mammals have their teeth.

Example: The thecodont structure of the dinosaur's teeth allowed for better chewing and processing of food.

Definition: An extinct group of early reptiles that had teeth set in sockets and are believed to be ancestors of dinosaurs and birds.

Example: The thecodont was an important part of the evolutionary history leading to modern reptiles.

Definition: A type of reptile that lived during the Permian and Triassic periods, which are believed to be direct ancestors of mammals.

Example: Therapsids were important in the evolution of mammals from reptiles.

Definition: Relating to a specific group of mammals that give birth to live young instead of laying eggs.

Example: The therian mammals include species like humans, dogs, and cats.

Definition: A member of a group of mammals that includes both placental mammals and marsupials.

Example: The kangaroo is a well-known therian, as it is a marsupial.

Definition: Describing something that has the shape or characteristics of a beast or animal, often used in relation to deities or mythological figures.

Example: The ancient sculpture depicted a theriomorphic god with the body of a lion and the head of a human.

Definition: A type of large, meat-eating dinosaur that walked on two legs and lived during the Jurassic and Cretaceous periods.

Example: The velociraptor is a well-known example of a theropod dinosaur.

Definition: A type of ray fish that has spines on its back, found in European and Pacific waters.

Example: The thornback is known for its distinctive spines and flat body.

Definition: Describing animals, especially horses, that come from a pure lineage or breed, often indicating high quality and performance.

Example: The thoroughbred horse won the race easily due to its exceptional training and lineage.

Definition: A type of horse that is bred for racing and has a pure lineage, often known for its speed and agility.

Example: The thoroughbred won the race by a large margin.