The Hearts are bonus points you can use almost everywhere in your zoo in order to increase the performance of some buildings, cages or, employees. You will find the description of the effects of the Hearts by visiting every building of your zoo. The Hearts are indeed a simple and magic way of boosting your animals' happiness.
Important: If you have 3 (three) Hearts, it means you can use your 3 Hearts, EACH DAY!!! Therefore, don't refrain from using them!!! ;-)
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