This document summarizes different species of whales, including the gray whale, blue whale, humpback whale, and polar whale. It provides details on the physical characteristics and sizes of each whale species. For example, it states that the blue whale is the largest animal to ever live on Earth at 30 meters long and weighing 100 tons. The document also lists some interesting facts about whales, such as their ability to tan and having individually unique tail patterns like human fingerprints. It concludes by discussing the historical overhunting of whales and celebrating World Whale Day on February 19th to raise awareness of protecting marine mammals.