Bee's. I've always been impressed by the size of insect brains, so small you need a microscope to see them, yet capable of navigation, reproduction, organization, self-protection, self-reliant and self-governing. Along with all the other things a brain has to do for motor control, flight, feeding and perceiving the world.
Bee's also use plants, flowers mostly and have a symbiotic relationship with them. Operating on what appears to be a well tested and pre-programmed set of instructions for which they do not deviate. Simple, Right?
Yet we as humans will find a way to kill them, unintentional as it may be, ignorant of the benefits they bring.