Which of the following species is NOT considered an ungulate?

The species that is not considered an ungulate is the chicken. Ungulates are animals that have hooves, which include species such as horses, sheep, and cows. These animals are characterized by their walking on the tips of their toes encased in hoofs, enabling them to run and carry their weight efficiently on land. Chickens, on the other hand, are birds and belong to a different classification that does not include ungulates. They have feet with toes but lack hooves, thus clearly distinguishing them from the hooved animals. Understanding the classification of these species helps to identify their characteristics and biological taxonomy, reinforcing the distinction between ungulates and other animal types like birds.