One does not have to deal with space exploration in order to find the intelligence of nonhuman origin in the Universe – it is enough to take a look at the planet Earth. Comparison of human and animal intelligence can be very difficult because intelligence exists in various forms. For example, a squirrel can remember the place where it buried hundreds of hazelnuts six months ago, while it is extremely difficult for them to remember people's faces. A dog recognizes its owner by the smell, but it cannot send an email. The question is – based on which properties is animals' intelligence compared to humans' intelligence? When making comparisons, scientists usually focus on several key capabilities that people have developed through history – making tools, the use of symbols, empathy and problem solving skills. Based on human intelligence standards, what do you think which animals are the smartest?
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