The Largest Bird: Ostrich¹ (Struthio camelus)

最大的鸟类：鸵鸟（学名：Struthio camelus）

The ostrich holds the title of the world's largest and heaviest living bird. Native to Africa, this flightless giant can reach heights of up to 2.8 meters (9 feet) and weigh over 150 kilograms (330 pounds). Its long, powerful legs allow it to sprint² at speeds of 70 km/h (43 mph), making it the fastest bipedal animal on land.

鸵鸟是世界上现存体型最大、最重的鸟类。这种不会飞的巨鸟原产于非洲，站立高度可达2.8米（9英尺），体重超过150公斤（330磅）。其强健的双腿使它能以70公里/小时（43英里/小时）的速度奔跑，成为陆地上最快的两足动物。

Unique Adaptations

独特的适应性

Egg Size: Ostrich eggs are the largest of any bird, weighing 1.4 kg (3 lbs)—equivalent to 24 chicken eggs!

羽毛结构: Unlike most birds, ostriches³ have loose, soft feathers for temperature regulation in arid⁴ climates.

防御机制: A single kick from its legs can deter⁵ predators⁶ like lions.

蛋的尺寸: 鸵鸟蛋是所有鸟类中最大的，重达1.4公斤（3磅），相当于24颗鸡蛋！

Feathers: 鸵鸟羽毛蓬松柔软，帮助它们在干旱环境中调节体温。

Defense⁷: 其腿部力量足以击退狮子等捕食者。