Dolphin. They can create long -term trade unions, help each other to search for food, support injured relatives and mourn their losses. Dolphins can recognize each other with the help of unique sounds similar to names.
Elephants. They may also look like friendship. For example, they take care of the injured and patient, sympathize with relatives and support each other. If a close friend is lost, they may show signs of grief and visit where their relatives die.
Mice. Apparently, incredibly social sensitivity. During their laboratory experiments, they refused to treat if they realized that their friends would be in trouble. According to some studies, when rats play with friends, ultrasound signals can be “laughing”.
Other species. Friendship is also found in Raven, chimpanzees, flying foxes, octopus.
Source: Ferra

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