Tibu on linnu kasvikujärk.
![Thumb](http://upload.wikimedia.org/wikipedia/commons/thumb/0/0c/Hen_with_chicks%2C_Raisen_district%2C_MP%2C_India.jpg/640px-Hen_with_chicks%2C_Raisen_district%2C_MP%2C_India.jpg)
Koorunud tibu on tibu kõige noorem järk.
Tibu kasvades saab temast noorlind.
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