Ostrich egg cells are exceptionally large compared to most other egg cells. They can measure around 170 mm (6.7 inches) in length and 130 mm (5.1 inches) in diameter. This large size is due to the need to accommodate the developing embryo and provide sufficient nutrients.
Similar to other egg cells, the ostrich egg cell consists of a cell membrane, cytoplasm, and a nucleus. The thick eggshell protects the contents from physical damage and provides a barrier against pathogens. The egg’s size also helps maintain stable internal conditions for the developing embryo.