These majestic animals are known to sing primarily to attract mates, but recent research suggests that they also sing to communicate locations. A study reports that whales also employ grammar in their songs. Humpback whales are endangered largely because of being hunted by man. As the government estimates, there were 15,000 whales before commercialized whaling, but today there are just 1,000 to 1,200. You can listen to the songs of the humpback whale here.