给定一段英文文字，提取出其中的所有名词并输出它们。
In the woods, there were many different kinds of trees, such as oak, pine, and maple. Birds chirped happily in the branches, while squirrels scampered up and down the trunks. The leaves rustled in the gentle breeze, creating a soothing sound.
trees, oak, pine, maple, birds, branches, squirrels, trunks, leaves, breeze, sound.