Information on shark ecology and individual and group actions has provided increased insight into their behaviour. Because large sharks feed on lesser ones, the habit of segregation by size appears vital to their survival. In a uniform grouping, dominance between various species is apparent in feeding competition, suggesting a definite nipping order. All sharks keep clear of hammerheads, whose maneuverability enhanced by the rudder effect of the head gives them a swimming advantage over other sharks. Attacks on humans occur when sharks are hungry, harassed, or, in some cases, defending territory, though many interactions with humans appear more likely to be due to mistaken identity. It should be noted, however, that shark attacks are much less frequent than other aquatic mishaps.
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