Temporal range: Late Jurassic
Supersaurus was a sauropod dinosaur, is one of the longest land animals yet discovered. It was a long-necked, whip-tailed giant, measuring about 138 feet (42 m) long and 54 feet (16.5 m) tall, with a 39 foot (12 m) long neck. It may have had very limited vertical neck mobility.
The first Supersaurus fossil was found in western Colorado, by paleontologist James A. Jensen in 1972, and was named in 1985. It is only known from an incomplete fossil which includes two shoulder blades 8 feet (2.4 m) long, ribs 10 feet (3 m) long, neck vertebrae 4.5 feet (1.4 m) long, and a pelvis 6 feet (1.8 m ) wide.