Blue whale, (Balaenoptera musculus), also called sulfur-bottom whale, the most massive animal ever to have lived, a species of baleen whale that weighs approximately 150 tons and may attain a length of more than 30 metres (98 feet).

: https://www.britannica.com/animal/blue-whale

The blue whale (scientifically referred to as balaenoptera musculus) is a large marine mammal that is part of the baleen whale (mysticeti) suborder and is the largest animal alive growing to lengths of up to 100 ft. long and weighing as much as 150 tons or more.

: https://www.whalefacts.org/blue-whale-facts/

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Amazing Facts About the Kangaroo. There are four species of kangaroo, the Red, Antilopine, Eastern Grey and Western Grey Kangaroo. Red Kangaroos are the largest marsupial and can grow up to 2 metres.

: https://onekindplanet.org/animal/kangaroo/

The kangaroo is a marsupial from the family Macropodidae (macropods, meaning “large foot”). In common use the term is used to describe the largest species from this family, especially those of the genus Macropus: the red kangaroo, antilopine kangaroo, eastern grey kangaroo, and western grey kangaroo.

: https://en.m.wikipedia.org/wiki/Kangaroo