Every winter, more than 100,000 cuttlefish gather in Australia in a mating period that is the only one in the world; but in 2026, fewer than 10 arrived and scientists are trying to figure out why The Times of IndiaAustralia is home to the only mass cuttlefish gathering in the world. This year these giants didn’t return The ConversationAustralia is home to the only mass cuttlefish gathering in the world. This year these giants didn’t return Phys.org