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
flagRepublic of Ireland
20%
10%
10%
60%
10
flagAustria
10%
20%
10%
60%
10
flagGermany
41%
11%
15%
32%
53
flagthe United Kingdom
42%
14%
16%
28%
50
flagthe United States
40%
13%
19%
26%
165
flagPoland
45%
12%
15%
25%
6291
flagIndia
58%
5%
9%
25%
74
flagUkraine
58%
15%
4%
20%
96
flagBelarus
60%
10%
10%
20%
10
flagRussia
62%
15%
5%
15%
53
flagGreece
50%
7%
28%
14%
14