A lion’s mane jellyfish swims beneath the waters at the Farne Islands, England. The archipelago of 16 to 28 separate islands (depending on the tide) off Northumberland is a summer home to many kinds of wildlife. (Dan Kitwood/Getty Images)

A lion’s mane jellyfish swims beneath the waters at the Farne Islands, England. The archipelago of 16 to 28 separate islands (depending on the tide) off Northumberland is a summer home to many kinds of wildlife. (Dan Kitwood/Getty Images)