sentence: Every male has a different song.
sentences_before: The male whale is known to sing for up to 22 hours at a time. Because whales do not have vocal chords, they make songs by forcing air through their nasal passages.
sentences_after: We don't yet know why they sing, it might be to call a female or scare away other males. The songs are made up of a pattern of low notes repeated over a period of hours or days. The whales slowly change their songs over a period of years.
concept_name: male
headings: Humpback whale Whale song
categories: Baleen whales