Nothing could be as exciting and pleasing as witnessing the beginning of a new life; be it of a human or an animal. And then watching the new born growing up from weak and feeble into strong and sturdy being is awe-inspiring and also satisfying, if you are responsible for that.
Chickens are not only friendly and entertaining, but also productive; they make sure you have a continuous supply of eggs and meat for your barbeque party. Starting your day with a cheesy omelet is the chickens' reward for taking care of them.