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Upside-down jellyfish lob tiny grenades to kill prey
Mucus secreted by a group of jellies, known as upside-down jellyfish, is filled with tiny, wriggling cell masses that allow them to fire stinging substances from a distance.
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Giant jellyfish spotted by divers off English coast
A giant jellyfish the size of a human has stunned a diver off the south-western coast of England.