Huge school of sharks 'flips the food pyramid'. A small channel hosts up to 700 sharks - far more than it can support based on the number of fish living there, an example of an "inverted trophic pyramid": the average biomass in the channel is skewed towards predators rather than prey.

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Huge school of sharks 'flips the food pyramid'. A small channel hosts up to 700 sharks - far more than it can support based on the number of fish living there, an example of an "inverted trophic pyramid": the average biomass in the channel is skewed towards predators rather than prey.