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For thousands of years, people have been fascinated by dolphins. Dolphins have developed a number of similar personality qualities to humans’, such as curiosity and sociability, despite having developed in vastly different environments, researchers have found. Recently, a British research team finished an eight-year study of Indo-Pacific dolphins off the coast of Western Australia. These dolphins can use different tools to search for food. The researchers found that these dolphins are more willing to walk with partners that like the same tool. Other parts, like family closeness or sex, have no impact on this relationship.

“It suggests that dolphins form social relationship based on shared interests,” UK biologist Simon said. Apart from dolphins, elephants, horses and bats are also known to form friendships. Are friendships only limited to the same species? Of course not.

In 2015, a goat Timur was originally left in the tiger Amur’s enclosure (围场) as a meal. But instead of eating Timur, Amur likes to play with Timur. Scientists said it’s not unusual among captive (圈禁的) animals. That’s because in captivity, animals don’t need to spend much time and energy marking their kingdom or looking for mates the way they would in the wild. They are actually more likely to feel bored. In this particular situation, the animal’s love to engage socially and playfully may be higher than eating.