Mostly, a cat needs to be given the room to get comfortable and adjust to the smell of a new person or animal. It especially helps to let your cat smell something the new visitor has touched, so that they can get used to the new smell. That way the smell will be more familiar and less threatening to the cat. For more information on why cats hiss visit the source.Source: OMGfacts
Cats directly walk on their toes. Of all animals, they have a unique skull that brings about large eye sockets and strong specialized jaw. In general, cats remain active during day and night. However, domestic cats are known to be rather more vigorous during evening and morning. While these cats spend a large amount of their time in homes, they can range several hundreds of meters from their focal point. Source: AnimalsTimes