Of course ants are animals. Jellyfish agricultutre here seems contrived. There are many creatures -- even amphibians - that harbor photosynthetic symbionts. But that isn't "farming."

Nice post. I wrote an article on this subject for existential:
http://www.existential.com/do-we-know-as-much-about-the-meaning-of-exist...

Any thoughts and comments appreciated.

Cheers, and keep up the great work, Marc (http://www.greenygrey.co.uk).