I saw a hummingbird , a female , I think , so I sat on the front porch to watch her and her mate take turns running patrol and eating . When I went to leave there were 4 birds . I think they were fighting over the feeders . That or it was two parents with babies about to leave the nest .

Based on the preceding passage, answer the following question Why would the narrator marvel at the scene on their porch ?
The narrator is fascinated by hummingbirds .