好象人是唯一流泪的灵长类。

"In sum, if we define crying as tearful sobbing, then we know that humans are the only primates that cry. If we define crying as emitting vocalizations that co-occur with distressing situations, then we can conclude that most monkeys and apes cry, especially as infants. If we are really asking whether humans are the only primates that feel sorrow, then we do not know the answer. Yet."

http://www.scientificamerican.com/article/are-humans-the-only-prima/

所有跟帖： 

• 我看见过狗流眼泪 -Lilac2003- ♀ (302 bytes) () 09/01/2015 postreply 13:41:07

• 马牛羊猪鸡鸭，，， 都流泪 -弓尒- ♂ (0 bytes) () 09/01/2015 postreply 13:58:27