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The 3rd-person omniscient narrative voice is most likely being employed here. The writing is in the 3rd person, and the narrator apparently can give access to Chad's thoughts, which suggests that the narrator is writing from a perspective that knows everything related to the story.
The main idea is about Dolphins. The 2 key details are how they take care of there babies and about their teeth.
Connotation of dump generally is Negative. When you first hear dump you think of a dumpster or garbage so it's negative