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By Amy McDermott
Gloomy octopuses used to blend in. They were just another cephalopod, drab-gray and medium-bodied, living in the ocean off east-central Australia. Until, a few decades ago, the octopuses started to spread.
They crept south, establishing populations down Australia's East Coast, a climate change hotspot where seawater temperatures are rising almost four times faster than the global average. Gloomies love the heat—and chowing down on shellfish. If the newcomers' appetites disrupt existing fisheries, researchers say, they could spell trouble.