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A manta ray is significantly larger than a scuba diver when they are side by side. You can visualize this by comparing the diver's 6.07 ft (1.85 m) height to the manta ray's 14.8 ft (4.5 m) length. Manta ray is about 2.4 times the size of scuba diver.

How much space each takes up
Manta ray is about 2.4 times the size of scuba diver.
Typical adult or standard sizes; real ones vary.