If the animals appear at the beginning, sorry it's a bug, just press the green flag again. Move the cloud with your mouse. When the cloud is over the sea, the water in it (the top left variable) increases. When over the land, if you have enough water, it rains, and the ground water increases. (variable under cloud water variable) You can control the evaporation rate with the sliders. If the land's green, plants will grow and they attract animals. Sorry if that sounds complicated. :)
