I found a story on TimesLive from a few weeks ago that mentions how a farm in Australia is feeding their Pigs ice cream, as a treat. Ok yes, there is a lot more to the story than just that.
Basically they're farming methane produced by the Pigs!
The manure from the 22,000 Pigs used to go to a land fill now goes into a huge pond. They then capture the methane gas and harness this gas to make electricity. They are managing to operate the entire farm on this electricity as well as selling some back to the grid!
So Pigs not only taste great and make all sorts of meaty treats, they can also generate electricity!
They truly are amazing creatures!