Usually, yes.
jaguars do not move in groups. they stay in the trees most of the time and do that alone
most animals move in groups its nearly impossible to name ALL of them. but i can name a few. Birds, lions, coyotes, wolves, turkeys, and lots more.
yes
Many girls like to look sociable, hence avoiding the "lonely look". As a girl myself, it is important to keep a small group of friends to seem and feel friend-worthy and noticeable.