Like its cousin, Diplodocus, Seismosaurus has a long neck. In addition to allowing it to graze over a large area without moving, it also allows the dinosaur to nose around places its bulky body prevents it from going, such as in between trees.
Seismosaurus has peg-like teeth, like Diplodocus. These are ideal for stripping vegetation from trees or low-lying shrubs but they're not so good for chewing up food. As a result, Seismosaurus swallows the leaves and stems more or less whole.
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