催产素水平、心率和其它生物测定学的数据表明，人和狗狗的互动会提升双方的融合激素水平并延缓心率。

In other words, when you pet your dog, both of you produce more of the same hormone in your brain that makes you fall in love with people, and both of you relax more.

换言之，当你爱抚狗狗时，你们的大脑会产生同样的荷尔蒙，变得更加放松。

Dolphin

Dolphin mothers sing to their babies while they're in the womb.

海豚妈妈给它们未出生的宝贝唱歌。

According to a study at the University of Southern Mississippi, dolphin mothers will make a "signature whistle" for the benefit of their calf while it's in the womb. This whistle is thought to act as a sort of "name" for the mother, allowing the calf and mother to locate each other easily once it's born.

南密西西比大学的一项研究表明，当海豚宝宝还在妈妈的子宫里时，海豚妈妈会发出一种“标志性哨声”代表自己。宝宝出生后，母子就可以凭借哨声轻松找到对方。

After the calf is born, other nearby adult dolphins will whistle less, likely to help the calf learn and use the right whistle.

同时，附近的成年海豚会减少发出哨声，帮助海豚宝宝学习使用正确的哨声。

Squirrel

Hundreds of trees become seedlings every year because of squirrels forgetting where they buried their food.

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