Even when more sea lions arrive, they can't seem to break down the sardines' coordinated defenses.
With a shoal this big, the sea lions need to isolate a smaller, more manageable group of fish.
But with so few predators, the fish still have the advantage.
All the sea lions can do is keep the sardines at the surface and wait for others to join them.
Tuna.
Their arrival changes everything.
Tuna attack from below.
Cutting off the sardines' escape route down to deep water.
Next to appear, shearwaters, excellent fliers, but also surprisingly agile, underwater.
With so many predators attacking from all sides, the advantage starts to shift away from the sardines.
