Blue whale - WORLD

Photo by Georg Wolf on Unsplash: https://unsplash.com/photos/WAgBaYHRaL4

The blue whale is a marine mammal belonging to the baleen whale parvorder. At up to 30 metres (98 ft) in length and with a maximum recorded weight of 173 tonnes (190 short tons) and probably reaching over 181 tonnes (200 short tons), it is the largest animal known to have ever existed.

By Kurzon [GFDL or CC-BY-SA-3.0], from Wikimedia Commons

They are really big :D