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18x18 · 25 words · hard
EXTINCTION, ORANGUTAN, SANCTUARY, ECOSYSTEM, ELEPHANT, TORTOISE, POACHING, GORILLA, CHEETAH, LEOPARD, PENGUIN, MANATEE, DOLPHIN, HABITAT, RESERVE, CONDOR, SALMON, PANDA, RHINO, TIGER, KOALA, EAGLE, CRANE, WHALE, TUNA