Amazon Giant Water Lily.
The Amazon Giant Water Lily has a fascinating reproduction system.
The white female Lily opens at night. A beetle, the Scarab Beetle, covered with a dusting of male pollen,is attracted to the strong, sweet perfume of the female flower and moves in to feed on the nectar. In the morning when the sun rises and the temperature increases the flower closes and some of the beetles are trapped. They continue to feed on the nectar throughout the day, distributing male pollen on the lily as they do. This results in the white female flower turning pink and become male. At nightfall the now pink male flower opens, the beetle is released covered with a dusting of male pollen and it moves onto another white female flower to begin the whole cycle again.