You can buy animals that generate money for you. A number displayed beneath each animal indicates how much money it yields; the higher the number, the rarer the animal. You can have a maximum of 10 animals. To remove an animal, press "Delete animal" and then click repeatedly on the specific animal you wish to remove (it might not disappear on the very first click). You can also increase your luck, which improves your chances of obtaining animals with higher values. I initially forgot to mention how to buy the animals: simply press the appropriate button and place your mouse cursor where you want the animal to appear; the animal will then show up there after a few seconds.
