Literally, the reason that Lennie likes these kinds of small animals is that he likes to pet them. In Chapter 1, that is what he talks about wanting to do. We also see this because his Aunt Clara gave him a rubber mouse he did not like it because it was no good to pet.
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In the first person point of view, the narrator is a character in the story and tells the story from using the first person narrator. Participates in the action of the story, can tell us only what he or she is feeling, thinking, or observing.