They have really long tail which they use for balancing and it helps it swim. The muscle attachments (the spines coming out) are vertical, suggesting the tail was taller than it was wide, and very muscular.
On some mammals, like foxes, cows and deer, the largest part for muscle attachments (the vertical bits coming out of the vertebrae) is above the shoulder, but on the ceratosaurus, it is above the back legs, showing the muscles were concentrated here.
I don't write much about dinosaurs, but Ceratosaurus is a good dinosaur to study; it looks similar to a T.rex, you can see the smilitarities with both modern birds and modern mammals.
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