After the boy's had mocked Percival's report of seeing the beast, by telling him no large animal could live on such a small island, Percival gave them pause for thought when he told them that the beast came from the sea.
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He says in comes out of the ocean at night. :P
Percival says that the beast comes from the sea. To help the whole situation, at this point the boys see a shark out in the water. Maurice pipes up that his dad said there are still unknown creatures in the sea. Then Maurice unhelpfully adds that it could be a squid. All the boys start arguing about whether a squid can come on land or not until Ralph silences everyone.
Apart from revealing his name and address Percival also revealed that 'the beast' lived in the sea. This put an instant end to the laughter and teasing of the older boys. As Maurice pointed out, "Daddy said they haven't found all the animals in the sea yet."
they went after the beast but jack decide to forget the beast and play rolling rock
Percival Mackey's birth name is Thomas Percival Montague Mackey.