The heaviest animal ever discovered may be sauropod dinosaur, Amphicoelias. It may have been 40 – 60 m (130 – 200 ft) in length, and may have had a mass of up to 122 tonnes (135 short tons).
Source: https://dinoanimals.com/dinosaurs/the-heaviest-dinosaurs-top-10/
Amphicoelias fragillimus may have been the longest known vertebrate. It may be longest than blue whale, which is on average the longest living creature, reaches over 30 m (98 ft) in length.
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