Mutualism Between Ants and Aphids
Aphids suck the sugar-rich fluids from their host plants. The aphids then excrete equally large quantities of waste, called honeydew, which is high in sugar content. Where there’s sugar, there’s bound to be ants.
(Cut short from Ask.com)
More insect photographs from me @http://www.flickr.com/photos/fujinliow/