In what period did the largest known animal ever live?

Jurassic
Triassic
Cretaceous
Quaternary (now)
At 190 tonnes in weight, blue whale is the largest known animal ever to have existed. The tallest and heaviest sauropod known from a complete skeleton weighed 23–37 tonnes. There were much larger sauropods, but they are known from only a few bones, and it is unlikely they matched a blue whale.
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Answers by country

Jurassic
Triassic
Cretaceous
Quaternary (now)
answers
flagAustralia
16%
8%
8%
66%
12
flagGermany
45%
15%
10%
30%
20
flagthe United Kingdom
39%
15%
17%
28%
46
flagPoland
46%
13%
15%
23%
5837
flagthe United States
40%
13%
20%
23%
144
flagIndia
61%
6%
7%
22%
63
flagUkraine
54%
18%
4%
20%
44
flagRussia
71%
7%
7%
14%
28