A dark shape with seven‑meter wingspan moves through blue water like a shadow that forgot to be dangerous. This is a manta ray, heavy as a compact car, gliding past divers close enough to touch yet showing no sign of aggression.The key is hardware and diet. Manta rays are obligate filter feeders: instead of teeth for biting, they use gill rakers and cephalic fins to sieve plankton from seawater. T...More