By one definition:
"Sentient animals are aware of their feelings and emotions. These could be negative feelings such as pain, frustration and fear. It is logical to suppose that sentient animals also enjoy feelings of comfort, enjoyment, contentment, and perhaps even great delight and joy."
Having seen beavers "surf" in rapids just for pure fun and pelicans glide and soar in thermals over prairie meadows, in my mind, our furry and feathery friends not only feel pain and stress but absolute joy as well.
It's amazing how an owl face (in this case a fledged juvenile born this Spring) can show so many different expressions. Here are just two:
PHOTO #1 - YOU LITTLE DEVIL YOU (Now I know where those "horn feathers" come from!)

PHOTO #2 - Angel Eyes
