I had a thought that maybe in the future, we won't be inundated by robots, but instead by biological creatures that have been engineered to fill a need. Sort of a jump-start on evolution... "Hey Evolution, here's a niche you haven't thought of yet. How about a type of bird that consumes pollution?"

We won't see this in our lifetimes, but it's interesting to think about. Disregarding the obvious ethical issues, if you could engineer a biological creature, what might it do? I'll get the ball rolling in the Comments section.