Plants cooperate with...

This group is intended to gather observations exhibiting cooperation among plants and animals, mainly arthropoda - not only insects. The bees are the first but not unique to cooperate with plants. The flowers are also not the only part which be of animal's interest! Recognition of arthropoda is strongly welcome although is not necessary. Also every explanation clarifying this cooperation will be appreciated. Please publish observations satisfying these intentions. Welcome and have a lot of... benefits! Friends, does anyone have photos of tiny hummingbirds taking nectar from flowers? Many thanks to all colleagues for the wonderful collection of observations!