* Chimpanzees and bonobos: Chimpanzees and bonobos are our closest living relatives, and they share many of our cognitive abilities, including the ability to use tools, solve problems, and communicate. They are also capable of learning and adapting to new situations.
* Dolphins and porpoises: Dolphins and porpoises are highly intelligent marine mammals that are known for their complex social structures, their ability to communicate using a sophisticated system of clicks and whistles, and their capacity for learning and problem-solving.
* Elephants: Elephants are highly intelligent animals that are known for their long memories, their ability to cooperate and work together, and their capacity for self-awareness and empathy.
* Dogs: Dogs are known for their loyalty, their ability to learn and understand human language, and their capacity for problem-solving. They are also very good at reading human emotions and responding accordingly.
* Pigs: Pigs are often underestimated in terms of their intelligence, but they are actually very smart animals. They are capable of learning tricks, solving problems, and even playing video games. They are also very social animals that enjoy interacting with other pigs.
It is important to note that this list is not exhaustive, and there are many other animals that could be considered to be very intelligent. Each species has its own unique set of cognitive abilities and strengths, and their intelligence can vary depending on the context and the task at hand.