which was the longest dinosaur?

Answer 1

Diplodocus

A list of sauropods that reached over 20 meters in length, including neck and tail.(descending order)

Amphicoelias: ?45-?62 m (?148-?203 ft)
Bruhathkayosaurus: ?28-?44 m (?92-?144 ft)
Supersaurus: 35 m (116 ft)
Seismosaurus: 32 m (106 ft)
Argentinosaurus: 22-30 m (73-98 ft)
Sauroposeidon: 29 m (97 ft) Note: tallest known dinosaur, at 18m (58ft)
Diplodocus: 25-27 m (83-88 ft)
Barosaurus: 24-27 m (79-88 ft)
Brachiosaurus: 25 m (83 ft)
Paralititan: 20-24 m (66-80 ft)
Antarctosaurus: 19-23 m (63-76 ft)
Apatosaurus: 22 m (73 ft)
Haplocanthosaurus: 21.5 m (68 ft)
Argyrosaurus: 18-22 m (60-73 ft)

Answer 2

Sauropods' most defining characteristic was their size. Even the dwarf sauropods (perhaps 5 to 6 metres, or 20 feet long) were counted among the largest animals in their ecosystem. Their only real competitor in terms of size is the Balaenoptera musculus, or blue whale. But unlike whales, they all lived on land. Some, like the diplodocids, probably held their heads low, while others, like Camarasaurus, held them high.

Their body design did not vary as much as other dinosaurs, perhaps due to size constraints, but they still displayed ample variety. Some, like the diplodocids, were extremely long, with sails running down the back of their spines, and with tremendously long tails which they may have been able to crack like a whip to make sonic booms. Supersaurus, at 40 metres (130 ft), is probably the longest, but Seismosaurus and even the old record holder, Diplodocus, are still extremely long. Though a possible century-old hoax, Amphicoelias fragillimus, of which only a drawing of a single vertebra survives, at 55 to 60 metres (180 to 200 ft) would have a spine even longer than B. musculus. The longest terrestrial animal alive today, the reticulated python, can only reach lengths of up to 10 metres (35 ft).

Answer 3

bausinosaruas...a plant eater