https://en.wikipedia.org/wiki/Largest_organisms

A member of the infraorder Cetacea, the blue whale (Balaenoptera musculus), is thought to be the largest animal ever to have lived.

https://animals.howstuffworks.com/animal-facts/question687.htm

... animal ever to exist? The current largest animal is the blue whale, but was it the largest animal to have ever existed? ... Most people believe that the largest animals to ever exist on Earth were the dinosaurs. However, one of the largest land ...

https://news.nationalgeographic.com/2017/08/largest-dinosaur-ever-titanosaur-fossil-patagotitan-science/

Aug 9, 2017 ... Dubbed Patagotitan mayorum, the long-necked behemoth lived about 102 million years ago and was likely more than 120 feet long and ...

https://twistedsifter.com/2012/04/15-of-the-largest-animals-in-the-world/

Apr 4, 2012 ... Below the Sifter looks at 15 of the largest animals in the world, ... It is a highly social species and can be found in groups as large as 100 ...

https://www.livescience.com/58992-largest-animals-of-their-kind.html

May 6, 2017 ... What is the largest bird, butterfly or marsupial? Live Science found 15 of the largest animals of their kind. Read on to find out who they are.

https://www.quora.com/What-is-the-largest-animal-that-has-ever-lived

○Blue whale is the largest animal that ever lived.Its belongs to the baleen whales.At up to 33.6metres (110ft) in length.Weight upwards of 200 ...

https://animals.mom.me/list-top-largest-animals-ever-recorded-history-7273.html

When people think about the largest animals that ever lived, dinosaurs are often the first thing to come to mind. It might come as a surprise that the largest animal  ...

https://www.smithsonianmag.com/science-nature/did-scientists-just-unveil-biggest-dinosaur-all-time-180964443/

Aug 9, 2017 ... “All the big sauropods for which we have good evidence seem to be ... “Even if we've discovered the largest terrestrial animals ever known,” ...

https://www.youtube.com/watch?v=QPcrBUdYfy4

Apr 18, 2018 ... The World's Largest Animal Ever - Nature's Biggest Beasts - BBC Two. BBC ... The blue whale is the largest animal to have ever lived. #bbc ...

https://www.smithsonianmag.com/smart-news/new-ichthyosaur-was-one-largest-creatures-ever-existed-180968751/

Apr 10, 2018 ... A fossil jawbone found in England suggests the 'sea monster' was nearly ... length, are often touted as the largest animals to have ever existed on earth. ... toothy snout that lived in the oceans during the age of the dinosaurs.