
Seismosaurus goes down in the record books as one of the longest land mammals to ever live. One of the most impressive features of this sauropod (beside its incredible size) is the exceptionally long and whip shaped tail that was likely utilized to stun predators. Researchers believe that the sound alone from a whipping Seismosaurus tail would have deafened predators while getting caught in it’s line of fire would have been brutal! Let’s take a look at just how huge this giant sauropod was.
Take a look at some Seismosaurus Numbers!

Seismosaurus Length
The estimated length of Seismosaurus is approximated to be 130 – 170 feet.
Taking the average of this size range, 150 feet is equal to:
The height of 25 six foot tall people.
The length of six fully grown male African elephants (24.6 feet per elephant)
The length of the fuselage of a Boeing 747-8 (40 feet)
…and just for fun: equal to the length of the diameter of 2156 nickels.
Seismosaurus Weight
Estimates of Seismosaurus’ weight vary but it is believed to have weighed in at around 100 tons or 200,000 lbs.
200,000 lbs is equal to:
40,000 five pound bags of sugar.
The same weight as a small fully grown adult blue whale.
Just more than 105 1967 Volkswagon Beetles
…and just for fun: equal to the weight of 160,000,000 average goose feathers.
Seismosaurus Height
Current estimates state that Seismosaurus stood at approximately 84 feet tall.
84 feet is equal to:
Just over a quarter of the size of the Statue of Liberty.
Around one and a quarter of the size of the height of the Egyptian Sphinx.
Just under five average height giraffes.
…and just for fun: equal to the height of 16,470 pennies stacked on top of each other.
Would you want to share the city with a fully grown Seismosaurus?