Dora,
You are right. Watching animals can melt stress, whether wildlife or household pets. My in-laws live in Leakey, TX and sometimes when I visit, I will go out on the deck and watch the show, especially early in the morning. The deer are beautiful and there is a wonderful variety of birds that you don't see in San Antonio.
Sometimes, it is fun to watch 2 kittens, or 2 puppies play together. As long as they are being nice, it is relaxation and enjoyable. Stress tends to disappear as we forget our human troubles and watch the animal kingdom.
And don't forget the fish tank at home. Watching fish has been shown in some studies to lower blood pressure and relax the watchers. Pet fish in the aquarium really are fun to watch. Fish are fabulous stress relievers.