The category "Domestic Animals" refers to various species of animals that have been tamed and bred by humans over generations for various purposes such as companionship, work, or food sources. This category encompasses animals that are incapable of flying, known as flightless birds, and those that are active during the day, referred to as diurnal animals. It is a subset of the broader category of all animals, indicating every form of life in the animal kingdom, whether domesticated or wild.