The Voyage of the Arctic Tern instructs his three friends remain with the Arctic Tern. Then he dons his scuba gear, plunges into the water, and swims toward the ship. A large octopus with fiery eyes guards the treasure chest on the deck. Bruno wrestles with the octopus, kills it, and touches the silver coins in the chest. Immediately, Morgan's pirate ship crumbles to dust. Then Bruno, the treasure chest, and the Arctic Tern vanish. Chris, Steve, and Adrian no longer remember how they each got safely home after this, nor can they remember anything about Bruno, the Arctic Tern, or the treasure. However, Adrian remains
Tern another by call, and siblings also recognise each other's vocalisations from about the twelfth day after hatching, which helps to keep the brood together. Vocal differences reinforce species separation between closely related birds such as the least and little terns, and can help humans distinguish similar species, such as common and Arctic terns, since flight calls are unique to each species. Terns have a worldwide distribution, breeding on all continents including Antarctica. The northernmost and southernmost breeders are the Arctic tern and Antarctic tern respectively. Many terns breeding in temperate zones are long-distance migrants, and the Arctic tern probably sees