Amazing animal fact of the day: At an average of almost 100 feet long and 180 tons, a blue whale can expand its throat to consume as much as 50 tons of water in one gulp. How many gallons is that? One on of water equals about 239.65 gallons. So 50 tons is about 11,982.5 gallons. That's about how much water the average person uses in 5 months. All that in just one gulp by a blue whale!