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
11%
5%
5%
77%
18
flagAustria
10%
20%
10%
60%
10
flagGermany
35%
16%
13%
35%
37
flagthe United Kingdom
41%
14%
16%
27%
48
flagIndia
58%
5%
9%
25%
72
flagPoland
46%
12%
15%
24%
6101
flagthe United States
41%
14%
20%
23%
156
flagUkraine
57%
16%
3%
20%
77
flagBelarus
60%
10%
10%
20%
10
flagGreece
50%
7%
28%
14%
14
flagRussia
65%
11%
6%
13%
43