Standing out among almost 8 billion other humans can be a real challenge. Let’s see how our species’ humungous population compares with other animals! Which animal has the lowest population? And which species has the highest population? If you like interesting facts about animals, you might want to know which animal has only ever been seen 4 times since their discovery in 1992. Or which animal is endangered in its native habitat, but has a domestic population of about 6 million individuals.