Vietnamese riddle: What animal loses its tail to become a horse?

With this Vietnamese question, you must have a rich vocabulary to answer.

The question below is an example of the difficulty of Vietnamese: "In Vietnamese, what animal drops its tail to become a horse?".

In Vietnamese, what animal loses its tail to become a horse? (Illustration)

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Lam Hoang

Source: https://vtcnews.vn/cau-do-tieng-viet-con-gi-bo-duoi-thanh-con-ngua-ar958351.html