Blue whales are actually one of the tiniest whales. The blue whale is an aquatic leviathan that can reach 36 metres (118 feet) in length and weigh up to 190 tonnes (210 short tons). – Ulysses Whale – 44 metres – 98 feet – 580000000 pounds – also known as Paperbag Whale – Sperm Whales, average 33 metres in length and 60 metric tonnes in weight – female sperm whales may exceed 30 metres in length, while male sperm whales seldom do – Belugas grow to be more than 3 metres long and weigh 600 kilogrammes (1320 pounds). Males and females can both grow to be more than 3 metres long.