What is on of the biggest animals that are bad threats to all other plants and animals?

Biggest living animal on Earth - The Blue whale
Biggest weight ever recorded for a blue whale was 190 tones and was 30 m (100 ft). Since whaling was banned, a 7.3% per year increase has been noticed since Soviet Union whaling has ended. Sadly, the Blue Whale remains listed as "endangered" on the IUCN Red List of threatened species this might not be threatning but it is the biggest. Sorry xxx