Animals have different mental capacities. To define them, it is necessary to carry out special intelligence tests. The Swiss scientist Alan Portman made special rating to find out what silliest being on the planet.
Hippopotamus
The first place in nonsense is held by a hippopotamus. On Portman's tests which are carried out at the beginning of the XX century it gained only 18 points. It means that the level of ingenuity of this animal is very low. Though it does not affect its ability to survival in any way. So, hippopotamuses live in flocks where there is always a leader. Thanks to the weight and the structure of a jaw they can protect themselves from any predators, whether it be a lion or a crocodile. To get rid of parasites they, as well as elephants, use dust and dirt. The same protection practices at them from the sun. All pack takes part in education of cubs. There are "nurses" who are engaged in direct nursing of young growth. His inability to training became the main criterion which confirmed the status of a hippopotamus as the silliest being on the planet. He cannot be tamed as an elephant or a monkey. Aggression of this animal can reach peak in relation to the person trying to teach him to act in circus.
Quail
It is also possible to distinguish from birds especially clever and vice versa. So, the quail is considered the silliest bird. The size of his brain is very small. It is connected with a low metabolism. Therefore the brain very quickly crosses all stages of life. Mental abilities of these silliest beings on the planet tend to zero. Their way of life is quite primitive. They live small flocks in which there is even no leader. Baby birds often remain thrown that increases death rate. Quails are not capable to organize to themselves the worthy dwelling therefore they often move in connection with destruction of land nests.
Cats
In spite of the fact that cats are accustomed to a tray, remember some phrases and communicate with the person, they are considered as one of the silliest animals. Social experience teaches them to nothing. They remain singles and sometimes are not capable even to go constantly to one place for excrements. The intelligence of the majority of the animals living in the wild nature and never communicating with people is much higher, than at a domestic cat. The Oxford scientists proved that when cats live in one house with dogs, they adopt at them some habits. But dogs at the neighbors study nothing as those have more primitive intelligence. The storing factor at cats can be ranked as a simple habit and weak training. Dogs are capable not only to understand teams, but also to realize the actions. Therefore on a question what silliest being on the planet, it is possible to call the cat family safely.