I have accumulated over a million of red hearts! What can I do with them?

You buy eggs with them. The eggs hatch the wildlife. Different wildlife gives you different things. For example, the monkey gives you bees. When you have hatched enough eggs to get the monkey, you can choose him, and he will show up on the main playing screen. Then you go through certain tasks...like the monkey playing or eating or dancing. Each activity takes a certain amount of time. Some animals complete their task in20 minutes and some animals take 8 hours. After the task is finished you can claim the reward.