Ratlarning bosh-tovuq uzunligi 8 dan 30 santimetrgacha bo'lishi mumkin 1. Kuyruq uzunligi o'zgaruvchan bo'lib, turlariga qarab, tovuqdan ancha qisqa yoki ancha uzun bo'lishi mumkin 1. Ko'chma ratlar sichqonlar oilasiga tegishli va ular 200 dan 400 grammgacha va ba'zan hatto 500 grammgacha vaznga ega. Ularning tanasi 20 dan 28 santimetrgacha, quyruq uzunligi 17 dan 23 santimetrgacha 2.
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