Tigers usually rest on the ground. As tigers living in temperate zones, the ability to keep their abdomen warm in winter is a critical factor, so the Northeast tiger has the longest abdominal hair among all tiger subspecies.
The hermaphroditic characteristics of the spotted hyena are completely opposite to those of humans, so is the social system of the spotted hyena also opposite?
The primitive food chain is mutually exclusive, so that different species can continue to survive in nature, piranhas have a nemesis even if they are fierce.
