The Octopus and Its Three Hearts

The octopus is a soft animal that lives in the sea. It has eight arms and no bones. But the most surprising thing is inside its body. The octopus has three hearts, not one.

Hobotnica je meka životinja koja živi u moru. Ima osam krakova i nema kosti. Ali najiznenađujuća stvar je unutar njezinog tijela. Hobotnica ima tri srca, ne jedno.

Two of the hearts push blood to the gills. There the blood takes in oxygen from the water. The third heart then sends this blood to the rest of the body, so the octopus has energy to move.

Dva srca tjeraju krv prema škrgama. Ondje krv iz vode uzima kisik. Treće srce zatim šalje tu krv u ostatak tijela, tako da hobotnica ima energiju za kretanje.

The blood of an octopus is blue, not red. It is blue because it has copper inside. This special blood helps the octopus live in cold, deep water. When the octopus swims, its main heart stops, so it likes to walk on the sea floor instead.

Krv hobotnice je plava, ne crvena. Plava je jer sadrži bakar. Ova posebna krv pomaže hobotnici živjeti u hladnoj, dubokoj vodi. Kad hobotnica pliva, njezino glavno srce prestane raditi, pa radije hoda po morskom dnu.