If you need fruit flies right away, please email juicesarthropods@gmail.com to inform us. All cups are prepared in advance and at various egg-laying and hatching stages. We will always do our best to send you cups with active fruit flies; however, the food can run out quickly in this case. If you do not want an abundance of fruit flies immediately, please let us know as soon as possible, and we will create a fresh cup for you. This fresh cup will contain plenty of food, and the active flies will start laying eggs and hatching within 2-3 weeks!