Do you know why it sleep with the mouth open? Because there are many small residues in his mouth after meal, he opens his mouth and waits for some birds to clean for him. How smart!
它吃完肉以后，牙缝里留下很多肉丝，但它又不能自己清除，所以它只能张开嘴巴让小鸟把牙缝里的肉丝清除掉。
Do you know why it sleep with the mouth open? Because there are many small residues in his mouth after meal, he opens his mouth and waits for some birds to clean for him. How smart!
它吃完肉以后，牙缝里留下很多肉丝，但它又不能自己清除，所以它只能张开嘴巴让小鸟把牙缝里的肉丝清除掉。
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