Phil Hellmuth, a professional poker player, divided poker players into four types, which he called animal names:
A mouse is like playing against your grandmother, who does FOLD with almost every hand.
Elephants are poker players who call your BET over and over and over and over again... until you have no more poker chips.
Jackals are crazy, unpredictable, aggressive poker players. They are players who can win a poker tournament.
Leo - the very best poker players can play conservatively, they can play a bit like a jackal. They try to do exactly what it takes to win at poker. They are hard to beat.