Manatees are specifically mentioned as animals that are not aggressive and harmless, therefore they are not a danger.
The question "Which animal is not danger?" is grammatically incorrect. A clearer way to phrase it would be: "Which animal is not a danger?" or "Which animal is harmless?". Based on the provided reference, manatees fit this description. They are described as sociable, harmless creatures who communicate peacefully and do not fight with other animals. While large, they are not aggressive. Therefore, manatees are an example of an animal that is not a danger.
