Answer: Sauroposeidon

On a scale of really tall things, humans aren’t very tall (with an average height that doesn’t even break 6 feet/1.8 meters), giraffes are kind of tall with males reaching heights of up to 18-20 feet (5.5-6 meters) or so, and then there are dinosaurs—where an average height of being taller than a several-story building was far from unusual across many different species.

Even among dinosaurs, however, there were exceptionally tall species. While giraffes might reach 20 feet (6 meters) in height, the lofty Sauroposeidon—that lived roughly 100 million years ago—had a shoulder height of 20-23 feet (6-7 meters) alone with an estimated total height of approximately 60 feet (18 meters) with its head fully raised and a tail-to-crown length of approximately 92-112 feet (28-34 meters).

To put that into perspective, that’s as tall as a small office building, and if you were to keep a Sauroposeidon as a pet and wanted to find it a suitable “dino house”, as it were, you’d need an airplane hanger big enough to accommodate a Boeing 787 Dreamliner jumbo jet.