Ngắm thú hai mặt - vật hai đầu
Một số động vật khi sinh ra không chỉ có đầy đủ các bộ phận mà thậm chí... còn dư một khuôn mặt hay một chiếc đầu nữa. Chúng vẫn sống bình thường, chỉ khác khi cho ăn cần hai bầu sữa.
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