The world's ten smartest animals. Pigs are very smart and love to be clean.

According to foreign media reports, we human beings have the ability to learn, think and solve problems. We have self-awareness. We can perceive existence. We have thoughts and feel others' feelings. We can make tools and use deception. We are creative and can think abstractly. We have language, with which we can express complex ideas. All these are evidence that we human beings are very smart. Of course, apart from human beings, some other animals are actually very smart too: