Related by context. Frequent words. (Click for all words.) 67 White Nose Syndrome 55 hibernating bats 52 caves 50 nose syndrome 48 WNS 47 limestone caves 42 amphibian populations 42 barrens 41 avian species 41 cave dwelling 41 cave 41 limestone cave 40 nocturnal creatures 39 Nipah virus 39 lava tubes 38 Carlsbad Caverns 38 karst 38 caverns 37 Burgess Shale 37 amphibians 37 archaeologically 37 igneous rock 37 fossilized bones 37 dinosaur fossils 36 middens 36 Mammoth Cave 36 hydrothermal vent 36 Chihuahuan Desert 36 geological formations 36 melting glacier 35 nocturnal animals 35 stalagmite 35 prehistoric 34 seamounts 34 dense forests 34 manmade structures 34 Namib Desert 34 habitats 34 dinosaur footprints 34 burrows 34 Caverns 34 cliff dwellings 34 limestone 34 dinosaur fossil 34 primeval forest 33 Chaco Canyon 33 trilobites 33 fossils 33 petroglyph 33 Prehistoric 33 geologic formations 33 lava tube 33 headwater streams 33 Canyon de Chelly 33 Dunbar Cave 33 Kartchner Caverns 33 swamps 33 beaver pond 32 trackways 32 creatures 32 mudflat 32 sandstone 32 rock outcrops 32 rock formations 31 lizard 31 Ngorongoro Crater 31 cavern 31 creature 31 Devil Den 31 unmapped 31 bottomlands 31 stalactite 31 marine reptiles 31 Cave 31 geologic formation 31 archeological sites 31 microscopic organisms 31 refuges 31 medieval fortress 31 woods 31 limestone formations 31 volcanic vents 31 volcanic crater 31 Ouachita Mountains 31 oxbow 31 petroglyphs 31 pictographs 30 river valleys 30 magma chamber 30 highlands 30 Peruvian Andes 30 steam vents 30 hydrothermal vents 30 caver 30 glacial lakes 30 Lascaux 30 underground cavern 30 glaciers 29 hollows 29 tropical jungles 29 mountainous regions