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and the gases in there, we had hydrogen sulfide, hydrogen sulfide in that cave, but some animals could survive in there. Some other unwelcoming places could include massive biome of the Amazon rainforest where new species of mammals and insects and plants are found almost daily now. Thermal vents under the Antarctica have shown out a lost world of new animals. The Himalayan mountains have also led scientists to brand new species. Most researchers agree that if there are any really, really large animals left to be discovered, they'll be found in the ocean. Just stopping.