Humans often underestimate animal intelligence, but many species have complex thinking and problem-solving skills to survive.
Elephants have exceptional memory and emotional intelligence and can distinguish between different human languages.
Orangutans share with humans the ability of displaced reference and can speak about the past, making them intelligent.
Cats' superior memory and brain with 300 neurons make them one of the world's smartest animals.
Gorillas have intricate social structures, high emotional intelligence, and Koko the gorilla had exceptional communication skills.
The New Caledonian crow's ability to use tools, such as creating a hook from wire, shows high intelligence.