How heavy are Whales, really?

A user was Zook.in for this yesterday, and the query caught my eye. My son often takes me down these trips where - for want of internet access or laziness to "switch on" - I end up giving him either hand wavy answers, or just ignore him if I'm really stumped.

One major use-case for mobile search ?

Anyhow:

Blue Whales can weigh upto 181 metric tonnes!
Averages::
Type/Weight
Blue/84
Finback/50
Bowhead/50
Right/50 (est.)
Sperm/35
Humpback/33
Smaller whales weigh in at a mere 4-6 tonnes. Heavy, huh ?
--Zook on sms:57575665--

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