"blue whale." YourDictionary, n.d. Web. 13 October 2018. <http://www.yourdictionary.com/blue-whale>.
blue whale. (n.d.). Retrieved October 13th, 2018, from http://www.yourdictionary.com/blue-whale
A very large baleen whale (Balaenoptera musculus) having a bluish-gray back and grooves on the throat. It is thought to be the largest animal ever to have lived on earth, reaching a length of up to 32 meters (105 feet).