A bait ball of frenzied anchoveta swarm in their tightly packed sphere and tornado formations to better protect themselves against the larger bonito and yellow fin tuna that are swimming nearby. The predators are hungry, and though the bait ball may make it harder to catch a meal, its silvery mass also attracts more attention.
This incredible bait ball clip, a follow up to this one, is from BBC Earth‘s The Blue Planet documentary series narrated by Sir David Attenborough.
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