Highly Venomous Sea Snakes Hunt in Huge Group | 20 Years of Planet Earth | BBC Earth

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0:00And anything fleeing from the crates

0:02will swim straight into the mouths of

0:03the waiting tree valley.

0:06There's nowhere to hide.

0:14And there are snakes here, too. Lots of

0:18them.

0:24These are banded sea crates. They lay

0:28their eggs on land, but they hunt here

0:31in the water.

0:37They're too slow to catch fish in a

0:40straight chase, so they seek prey that

0:42is hiding in the nooks and crannies of

0:44the coral.

0:48Their bite is highly venomous and

0:50paralyzes their victims.

0:57And on this reef, the snakes do not hunt

1:00alone.

1:07Sholes of yellow goatfish and trival are

1:11seeking similar prey, and they attract

1:14the snake's attention. As one group of

1:16hunters searches the reef, they're

1:18joined by the other.

1:28At least 30 snakes have now joined the

1:32caravan.

1:38The big fish scare the prey into cracks

1:42and there the snakes can catch them and

1:45anything fleeing from the crates will

1:47swim straight into the mouths of the

1:49waiting tree valley.

1:52There's nowhere to hide.

1:59As the raiders scour the reef, more and

2:03more snakes join the hunt.

2:26This cooperation between snakes and

2:29fish, spectacular though it is, has only

2:32recently been observed, for it only

2:34happens on the most remote reefs in

2:36Indonesia.

2:47Perhaps such hunting alliances were once

2:49a common sight, but today no more than

2:526% of Indonesia's reefs are in their

2:55pristine state.

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