The creatures are stirring quietly.

Meaning: This sentence is similar to the first one, but it is more specific because it uses the definite article "the" to indicate that we are talking about particular creatures.

Choice of Words: The is a definite article used to specify a particular noun. Creatures is a general term used to refer to any living thing, whether it be an animal, insect, or even a mythical being. Are is a verb that indicates the present tense of the verb to be. Stirring means to move slightly or make a slight movement. Quietly means to make no noise or very little noise. When you put them together, "The creatures are stirring quietly" creates a picture of specific living things moving around in a very subtle way, almost as if they are trying to avoid being noticed.