The largest specimens of these may weigh 100 tonnes.
A specimen of this size may weigh 3-4 kg (6-9 lb).
A gorgeous specimen, it weighed nearly 12 pounds and set us back $40 and change.
The specimen stood 45 feet, weighed 20 tons and was about 70 years old.
Its length is between 30 and 60 cm and large specimens, which might be over 25 years old, weigh almost 5 kg.
The full-grown specimens were about four meters in length and might have weighed two or three tons.
The specimen weighed 3 pounds and 11 ounces while measuring in at 9.75 inches long.
The largest known specimen of this species weighed an estimated 170 kg (370 lb).
At a third of the size, the smaller specimen would have weighed about 200kg, the size of a pony, and been 4.5m long.
The largest specimens measured 25 feet long and weighed 550 pounds.
