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The 11 examples below are representative cave animals and animal groups, not a list of species found in every cave. A bat that leaves at dusk and a blind cave fish may both be described as cave animals, but their habitats, diets and adaptations are very different.
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What counts as an animal that lives in a cave?
“Lives in a cave” can describe several ecological relationships. A trogloxene uses a cave but must regularly return to the surface for food or another part of its life cycle. Many bats fit this description: they roost underground, then fly outside to feed. A troglophile can complete its life cycle in a cave but may also occupy suitable surface habitat. A troglobite is a permanent underground specialist whose survival depends on cave conditions.
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These categories are useful, but they are not rigid labels for every population. A cave-associated species may be more dependent on underground habitat in one region than another, and a group such as “cave salamanders” includes animals with different degrees of specialization. The safest wording is to describe what the animal actually does rather than assume that every individual is permanently subterranean.
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| Animal or group | Typical cave relationship | Where it is found | Useful adaptation or behavior |
|---|---|---|---|
| Bats | Usually trogloxene | Entrances, ceilings and chambers used as roosts | Navigation and seasonal roosting; many leave to feed |
| Cave salamanders | Varies from cave-associated to highly adapted | Moist passages and underground streams | Dependence on moisture; some join cave predator-prey webs |
| Cave crayfish | Often troglobitic in suitable systems | Subterranean streams and pools | Adaptation to darkness and scarce food |
| Cave shrimp | Often cave-adapted | Underground water | Specialization for permanently dark aquatic habitat |
| Cave fish | Some are permanent specialists | Subterranean streams, pools and flooded passages | Reduced eyes or pigment in some lineages; non-visual senses |
| Cave crickets | Usually trogloxene | Cave entrances and adjoining surface habitat | Commute in and out; transfer surface food underground |
| Cave beetles | Varies by species | Rock, sediment and organic debris in cave passages | Some populations show cave-associated adaptations |
| Cave spiders | Troglophile or cave-associated | Walls, ceilings and entrance zones | Predation in low light; orb-weavers can take cave insects |
| Isopods | Some are cave specialists | Subterranean water, damp sediment and debris | Low-light or dark-habitat specialization |
| Amphipods | Some are cave specialists | Underground streams and pools | Small-body aquatic scavenging in nutrient-poor water |
| Millipedes | Some are cave-adapted | Damp floors, soil and decomposing material | Detritus feeding where organic matter accumulates |
11 animals that live in caves
1. Bats
Bats are the most familiar cave animals, but a cave is usually a roost rather than a complete bat habitat. Some species use chambers to sleep, hibernate or raise young and leave after dark to catch insects or other food outside. Gray bats are a well-documented example of bats that roost on cave ceilings. The U.S. Fish & Wildlife Service warns that gray bats are particularly sensitive to disturbance caused by people entering and exploring caves, especially when colonies are roosting or raising young.
Bat use can change by season. A cave may be important for maternity colonies, winter hibernation or a temporary stopover without being occupied year-round by every bat that enters it. That is why bats are generally treated as cave guests rather than automatic troglobites.
2. Cave salamanders
Cave salamanders occupy moist underground passages, pools and stream edges. Some species or populations are strongly adapted to cave conditions, while others spend part of their lives outside. Their amphibian skin requires moisture, making cool, humid cave environments valuable refuges.
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They can also be predators in cave food webs. In Mammoth Cave, the National Park Service describes salamanders feeding on cave crickets and other small prey. Their presence shows that a cave is not simply a shelter; it can contain active predator-prey relationships even when energy and food are limited.
3. Cave crayfish
Cave crayfish are freshwater crustaceans found in underground streams and pools. The National Park Service includes them among cave-adapted animals. In a permanently dark stream, finding food and avoiding hazards cannot depend on ordinary daylight vision, so selection may favor sensory and behavioral changes suited to the underground environment.
Not every crayfish seen near a cave is a permanent cave specialist. Surface water can enter a cave, and some species use both habitats. The term “cave crayfish” therefore describes a useful ecological group rather than one universal level of adaptation.
4. Cave shrimp
Cave shrimp are another crustacean group associated with underground water. They live in dark pools or streams where food may arrive as fine organic particles, washed-in material or remains from other organisms. Their small size and aquatic lifestyle allow them to occupy spaces that larger surface animals cannot reach.
As with cave crayfish, the degree of dependence varies among species. Some cave shrimp are highly specialized for life underground, while others may be linked to groundwater or connected surface waters.
5. Cave fish
Cave fish are among the clearest examples of permanent underground specialists. Some lineages spend their entire lives in subterranean streams, pools or flooded passages. NOAA Ocean Exploration identifies reduced or absent eyes and reduced pigmentation as common examples of cave adaptations, while noting that these traits are not universal in every cave-associated animal.
In darkness, senses that detect water movement, chemicals or contact can matter more than vision. NOAA explains the evolutionary process this way: “Adaptations do not happen because an animal ‘wants to adapt’ or ‘needs to adapt.’” Its educational page, last updated September 29, 2020, adds that adaptations arise as random events and become more common when they give an organism an advantage in survival and reproduction. NOAA’s discussion is framed around marine caves, so its general explanation should not be read as proof that every terrestrial cave fish has the same traits.
6. Cave crickets
Cave crickets commonly move between the surface and underground passages. The National Park Service’s Mammoth Cave material describes them commuting in and out, making them classic examples of trogloxenes. They can bring energy into a cave indirectly: they feed outside, enter the cave and become food for other animals or leave droppings and remains behind.
In Mammoth Cave, cave crickets are preyed upon by cave orb-weaver spiders and salamanders. Their daily movement links surface habitats to the underground food web and helps explain how predators can survive in a place with little plant growth.
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7. Cave beetles
Cave beetles appear in educational examples from Texas Parks & Wildlife. Beetles occupy a wide range of niches, including spaces under rocks, sediment, damp debris and the cave entrance zone. Some species merely shelter underground, while others have populations adapted to darkness and limited resources.
Because “cave beetle” covers many species, it is better to describe a particular beetle’s habitat and traits than to assume that all cave beetles are blind, pale or permanently subterranean.
8. Cave spiders
Cave spiders live on walls, ceilings and entrance passages, where they hunt insects and other small animals. The sources identify cave spiders and cave orb-weaver spiders as part of cave communities. Orb-weavers can capture cave crickets, placing them directly in the predator-prey network described for Mammoth Cave.
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Scan for outdated or missing drivers - takes under a minuteDriver Scan →Repair Windows errors before they cause bigger problemsFix Now →Some spiders are able to live both underground and outside, while others are more restricted to cave conditions. Their webs also demonstrate that caves can support predators even when primary food production is scarce; the prey may enter from the surface or arrive in organic material carried by water.
9. Isopods
Isopods are small crustaceans that include aquatic and terrestrial forms. The National Park Service lists them among animals adapted to cave life in the Ozark National Scenic Riverways. Underground isopods may live in water, damp sediment or decomposing debris, depending on the species.
They are part of the low-energy community that processes organic matter rather than relying on sunlight inside the cave. Their cave adaptations can include changes in color, eyes or sensory behavior, but those features are not identical across all isopod species.
10. Amphipods
Amphipods are laterally compressed crustaceans commonly associated with freshwater. Cave-adapted amphipods occupy underground streams and pools, where they may graze on microbial films, scavenge or consume fine organic particles. The Ozark National Scenic Riverways National Park Service page includes them among animals adapted to cave life.
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Because underground water systems are connected to the surface in complex ways, amphipods may receive nutrients from material washed through cracks, sinkholes and stream entrances. Their presence does not mean that every part of the cave is isolated from the outside world.
11. Millipedes
Millipedes occur on damp cave floors and in areas where soil, leaf litter or other organic material accumulates. The National Park Service’s cave biology overview lists millipedes among cave-adapted animals, and its Junior Cave Scientist booklet also includes cave millipedes.
As detritus feeders, they help break down dead plant material and other organic debris. Some millipedes use caves temporarily, while others have populations specialized for the stable darkness and humidity underground.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.How cave animals survive without sunlight
Limited food and outside energy
Most caves receive little or no sunlight, so they cannot support a large plant-based food chain inside their deepest passages. Energy enters when water washes in soil, leaves, roots and microscopic organic particles; when animals carry food underground; and when droppings or carcasses accumulate. Bats that leave to feed and cave crickets that commute between the surface and cave are especially important links.
This outside connection explains why a cave can contain predators, scavengers and decomposers despite having no ordinary vegetation. Food availability is often patchy, so cave animals may have slow growth, low activity or specialized feeding behaviors. Conditions differ among dry passages, stream caves, lava tubes and flooded systems, and no single food-web description applies to all caves.
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Darkness, eyes and color
Permanent darkness can make eyes and pigmentation less useful, and some cave lineages evolve reduced eyes, pale bodies or both. These are examples, not requirements. Many cave users retain ordinary eyes and coloration because they spend time at the entrance or outside. A cave cricket or bat can navigate between bright and dark habitats without the extreme changes seen in some cave fish or aquatic invertebrates.
Non-visual senses
Touch, chemical cues, vibration and detection of water movement can help animals find food and avoid danger underground. The exact sensory changes differ by lineage and environment. A fish in a flooded passage faces different problems from a spider on a dry wall, so their solutions should not be treated as interchangeable.
How many animals can live in one cave?
Counts are local and depend on what area and category are being measured. Mammoth Cave National Park says nearly 160 animal species are regular inhabitants hundreds of feet below the surface in that cave system. That is not a global estimate and should not be applied to every cave.
Carlsbad Caverns National Park lists 17 bat species and more than 600 insects in a park-wide checklist; the insect list is explicitly incomplete, and the figures refer to the park rather than a count of animals living inside the cavern itself. A separate Natural History Museum source gives an estimate of 20 million bats for the colony at Bracken Cave, Texas. That figure is an estimate for the named colony, not a census of all cave bats.
How to observe cave wildlife responsibly
- Stay on authorized routes and follow the specific cave or park’s current access rules.
- Keep away from roosting bats, salamanders, nesting areas and pools; do not touch animals or their habitat.
- Use low-impact lighting and avoid loud noise, flash photography and blocking narrow passages.
- Never move rocks, collect invertebrates or introduce food, soil or water into a cave.
- Take special care during seasons when bats are hibernating or raising young. Gray bats are particularly sensitive to disturbance from cave entry and exploration.
Access rules are not identical everywhere. A recommendation to avoid disturbing wildlife is general conservation guidance, not a claim that every cave has the same closure dates, permits or visitor regulations.
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