What was the largest animal ever?

The largest animal ever is the blue whale (Balaenoptera musculus).

Key characteristics of the blue whale include:

• Length: Blue whales can reach lengths of up to 98 feet (30 meters), with some reports of individuals reaching up to 110 feet (33 meters).
• Weight: They can weigh as much as 200 tons (approximately 180 metric tonnes), with their tongues alone weighing as much as an elephant and their hearts as much as an automobile.