Pot-bellied and lumbering, a therizinosaurus at first glance seem like a very non-threatening herbivore, but make no mistake: this bird-like dinosaur is not to be taken lightly. While they don't have wings, a therizinosaurus has long arms ending in three fingers each pronged with a claw as long as a longsword. Therizinosaurus is often found in dry grasslands, often on the edge of deserts. They use their long necks to reach tree branches for feeding.