Dinornitidae is a bird species in the ostrich order of the terror bird family. The abdominal feathers are yellow, and the other parts are yellow and black in color. Enlarged body, degeneration of upper limbs, and short and thick lower limbs; The neck is covered with feathers and is relatively short; There are three toes. In 1843, it was named the terror bird by Owen, meaning a large bird that can scare people. Resting in the primitive lowlands and coastal forest grasslands of the southern islands of New Zealand. Living as a couple, each pair has their own territory. Cannot fly, runs slower than ostriches. They feed on berries, grass seeds, and roots, and sometimes also collect some insects. It is one of the largest birds on Earth.

The African ostrich is a species of ostrich in the ostrich family of the ostrich order. The head is small and triangular, the mouth is short and flat, the neck is slender and composed of several keratin sheaths, the upper part is yellow, and the lower part is pink; There is a pair of short wings that cannot fly and have degenerated into a state without flight feathers. The tail feathers are fluffy and drooping, and each tail vertebra is separated; The legs are long and thick, with some bare feathers, pink in color; The feet are large, and there are keratin pads under the toes, which are elastic and can insulate heat. Distributed in Africa and other regions. Often inhabiting deserts, grasslands, and shrubs. Strong heat resistance, most active in the early morning and dusk, loves to live in groups, enjoys drinking water and bathing.