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
12%
6%
6%
75%
16
flagGermany
36%
12%
15%
36%
33
flagthe United Kingdom
40%
14%
17%
27%
47
flagPoland
46%
12%
15%
24%
6013
flagIndia
60%
5%
8%
24%
70
flagthe United States
42%
14%
20%
22%
153
flagBelarus
60%
10%
10%
20%
10
flagUkraine
56%
18%
4%
19%
66
flagGreece
46%
7%
30%
15%
13
flagRussia
71%
7%
7%
13%
38