Apatosaurus excelsus

This famous long-necked, long-tailed wonder belongs to a group called "sauropods." This group of animals are the largest to ever roam our planet. Apatosaurus was an herbivore (plant-eater) and it walked on all four legs. To reach tree tops, it may have reared up on its hind legs and used its tail as a "third leg."

Scientific Name: Apatosaurus excelsus 
Pronunciation: uh-PAT-oh-SAW-rus ek-SELL-sus
Meaning: "deceptive lizard"
Locality Found: Colorado, Wyoming, Utah
Age: Late Jurassic, 154 to 144 million years ago
Length: 22 meters (73 feet) long
Height: 4.5 meters (15 feet) tall
Characteristics: herbivorous dinosaur that probably spent most of its time reaching for leaves with its long neck

Image credits: Rick Spears.