It is known that some animals are smarter than others. And at some point，humans started keeping them as pets. What are the world’s smartest pets andanimals？ Here are some of them.

眾所周知，有些動物比其他動物聰明。在某個時候，人類開始把它們當寵物飼養(yǎng)。世界上最聰明的寵物和動物有哪些？以下是其中的幾種。

1. African Grey Parrots

非洲灰鸚鵡

African grey parrots areone of the most intelligent1birds in the world. They canunderstand some human languageand speak like a human. Researchershave found that they also haveproblem -solving2 skills and excellentmemories that could be better than ahuman toddler3.

非洲灰鸚鵡是世界上最聰明的鳥類之一。它們能聽懂一些人類語言，并模仿人類說話。研究人員發(fā)現，它們解決問題的技能和出色的記憶力可能比人類幼兒還要好。

2. Pigs

豬

Many researchers found thatpigs have the spatial awareness4and good memory as a humantoddler. They also have high levels ofsocial5 and emotional6 intelligenceto communicate with other pigs andmany other kinds of animals.

許多研究人員發(fā)現，豬和人類幼兒一樣具有空間意識和良好的記憶力。它們也有很高的社交智能和情商，可以和其他豬以及其他種類的動物交流。

3. Dolphins

海豚

Dolphins are some of the smartestanimals in the world. They are like thehumans of the sea. Their brains weigh about3.5 pounds， giving them the second-highestbrain -to -body size ratio7 in the animalworld. Dolphins have been known to usetheir high intelligence to make social groupsand use tools.

海豚是世界上最聰明的動物之一，它們就像海洋中的人類。它們的大腦重約3.5磅，這讓它們的大腦與身體的比例在動物界排名第二。眾所周知，海豚利用它們的高智商來組成社會群體，并會使用工具。

4. Crows

烏鴉

birds in the world. They are not ascharismatic8 as the African greyparrotes， but they are better atdealing with the difficulties in bothcountries and cities.

烏鴉是世界上最聰明的鳥。它們不像非洲灰鸚鵡那樣有魅力，但它們更擅長應對不管是鄉(xiāng)村還是城市里的困難。

5. Squirrels

松鼠

Squirrels are so cute and they aresmarter than we think. They know howto store and protect their food inlong winter. To confuse9 the thieves10， they store their food indifferent places.

松鼠太可愛了，它們比我們想象的還要聰明。它們知道如何在漫長的冬天儲存和保護自己的食物。為了迷惑小偷，它們把食物存放在不同的地方。

Those pets and animals areimportant part of our world. We shouldknow them and love them more.

那些寵物和動物是我們這個世界重要的組成部分。我們應該多了解和愛護它們。

（英語原文選自：animals.howstuffworks.com）