20 Types of Bats in California
California hosts over 20 bat species, from the common Mexican free-tailed bat to the rare western red bat. Look for them at dusk near water or under bridges. This guide covers the most likely species, field marks, and best spots to start your search. Bats are California's hidden insect controllers and pollinators. Learning to tell species apart takes just a few key observations: wingspan, ear shape, flight pattern, and fur color. Most sightings happen in spring through fall when insects are abundant. The state's diverse habitats, from coastal cliffs to mountain forests to urban areas, support different species in different regions. This guide focuses on the most common and identifiable bats, plus tips for distinguishing lookalikes.
By Tim, founder of Easy Street Markets. I maintain the wildlife database and verify every animal and source myself. Updated June 30, 2026.
- 8
- species recorded
- July, August, September
- peak months
Verified species, source iNaturalist
20 types of bats recorded in California
20 bat species have a verified observation record in California across bats (order Chiroptera), each with at least 10 confirmed sightings. The full list, ranked by how often each is recorded, is below.
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Also recorded in California
| # | Species | Scientific name | Records |
|---|---|---|---|
| 13 | Western Bonneted BatNativeEumops perotis | Eumops perotis | 39 |
| 14 | Western Small-footed MyotisNativeMyotis ciliolabrum | Myotis ciliolabrum | 31 |
| 15 | Pocketed Free-tailed BatNativeNyctinomops femorosaccus | Nyctinomops femorosaccus | 29 |
| 16 | Western Yellow BatNativeLasiurus xanthinus | Lasiurus xanthinus | 28 |
| 17 | Long-legged MyotisNativeMyotis volans | Myotis volans | 27 |
| 18 | California Leaf-nosed BatNativeMacrotus californicus | Macrotus californicus | 24 |
| 19 | Fringed MyotisNativeMyotis thysanodes | Myotis thysanodes | 22 |
| 20 | Big Free-tailed BatNativeNyctinomops macrotis | Nyctinomops macrotis | 16 |
Plus 4 more recorded only rarely (fewer than 10 verified sightings). Counts from verified iNaturalist observations. Photos by iNaturalist observers, reused under the licence each observer chose.
Real sighting data, source iNaturalist
7,270 verified observations on iNaturalist of bat have been recorded in California, most often in July, August, September.
When bat are recorded in California
California hosts over 20 bat species, from the common Mexican free-tailed bat to the rare western red bat. Look for them at dusk near water or under bridges. This guide covers the most likely species, field marks, and best spots to start your search.
Bats are California's hidden insect controllers and pollinators. Learning to tell species apart takes just a few key observations: wingspan, ear shape, flight pattern, and fur color. Most sightings happen in spring through fall when insects are abundant. The state's diverse habitats, from coastal cliffs to mountain forests to urban areas, support different species in different regions. This guide focuses on the most common and identifiable bats, plus tips for distinguishing lookalikes.
1. How many types of bats live in California?
California is home to at least 24 bat species, making it one of the most bat-rich states in the U.S. The most widespread include the Mexican free-tailed bat, big brown bat, and pallid bat. Several species are less common or listed as sensitive, so knowing the common ones first helps narrow identification.
In California, bat sightings usually improve when you slow down and match your first stop to the most useful ID markers and likely lookalikes. Use thestate wildlife huband theroute guideto narrow your first area, then check access, weather, and distance before you settle in. A short walk with one clear viewing plan often beats covering too much ground, especially when habitat changes fast from open edges to brush, wetlands, timber, shoreline, or neighborhood cover.
2. What are the best field marks to identify California bats?
Focus on size, ear shape, and flight style. Small bats (3-5 inch wingspan) like the western pipistrelle have erratic, fluttery flight. Medium bats (10-14 inch wingspan) like the big brown bat fly straight and fast. Large bats (14-17 inch wingspan) like the pallid bat have distinct large ears and a slow, maneuverable flight. Fur color varies from gray to reddish.
In dim light, ear position and size are your fastest ID clues. If the ears are short and hidden in fur, you're likely looking at a free-tailed bat or big brown bat. Long, upright ears signal a myotis (little brown bat or similar) or a pallid bat. Flight silhouette matters too: Mexican free-tailed bats have a straight, fast trajectory, while little brown bats weave and dart.
3. Where in California are bats most often seen?
Bats are most often noticed near water sources: rivers, lakes, and reservoirs, especially in lowland regions like the Central Valley and coastal areas. Bridges and old buildings in urban areas also host colonies. In mountain areas, look near forest edges and meadows at dusk.
See ourstate animal guidefor the next step.
4. What is the best season for bat sightings in California?
Spring through fall (March to October) is primetime. Bats are most active after warm days, with peak activity in late summer when pups are weaned. Winter bat activity is minimal except in mild coastal areas. The best time of evening is 30 minutes after sunset.
5. Which California bats are most easily confused with each other?
The big brown bat and Mexican free-tailed bat look similar in flight but the free-tailed bat has a tail that extends beyond the tail membrane, and its flight is faster and more erratic. The pallid bat's large ears (over half the head length) separate it from all others. The hoary bat has a distinctive frosted appearance and is rarely seen.
When identifying in the field, silhouette matters as much as detail. Free-tailed bats often hunt high and fast over open areas. Big brown bats patrol lower, more methodically. Pallid bats hover and flutter more slowly, sometimes snatching prey from the ground. These flight patterns narrow the field quickly.
6. How can I attract bats to my yard in California?
Install a bat house on a pole or building, facing south or southeast, at least 10 feet high. Water features like small ponds or birdbaths also draw insects, which attract bats. Avoid pesticides to keep insect prey abundant. Native plants that attract nocturnal insects help too.
7. Which California bat species are rarest or hardest to find?
The western red bat, spotted bat, and fringed myotis are among the trickiest to encounter. The spotted bat is striking (white spots, huge ears) but rare and prefers high desert canyons. The western red bat is solitary and hides in oak trees, making it elusive despite its beauty. The fringed myotis has short, stubby ears and a fringe of hairs on its tail membrane, but it is uncommon in coastal regions and more likely in interior valleys and mountains. These species are not endangered but are infrequently reported, so finding one is a special sighting.
8. How do I tell myotis bats apart from each other in California?
California's myotis group includes the little brown bat, western small-footed bat, and Yuma myotis. They are tricky because they look similar: all are small, dark, with short ears tucked into fur. The little brown bat is the most common and strong. The western small-footed bat is even smaller and paler. The Yuma myotis prefers water sources and is smaller than the little brown bat. In the field, size and ear length help: little brown bats are stockier and have longer ears that are more prominent. The Yuma myotis has a darker face. Without a hand net, these can be challenging to separate, but knowing they all prefer different microhabitats helps: little brown bats roost in attics and caves across California; Yuma myotis favor low water sources; western small-footed bats prefer rocky canyons and cliff faces.
9. Where can I find more identification help?
Check ourbat hub pagefor species comparisons and range maps. For California-specific resources, visit theCalifornia wildlife page. Local bat groups often host guided evening walks. For field-friendly gear, explorebat-themed shirts and stickersto support your interest.
10. What bat-related gear do you recommend for field trips?
A good headlamp with red light mode keeps bats undisturbed. A compact field notebook and binoculars help with identification. For a fun reminder of your outings, check out these items:
Cute Bat Sticker []() A durable vinyl sticker perfect for water bottles or field journals. Check Price and Availability
Bat Animal Short-Sleeve T-Shirt []() Comfortable cotton tee with a realistic bat graphic. Check Price and Availability
Baby Bat Cartoon T-Shirt []() A fun, lightweight tee for casual bat appreciation. Check Price and Availability
Cute Bat T-Shirt []() A simple, adorable design for bat lovers of all ages. Check Price and Availability
11. Plan your bat viewing trip in California
Use this widget to find top spotting locations, recent roost reports, and seasonal tips for your visit.
See ourtour planning ideasfor the next step.
Gear and field guides
Frequently asked questions
1. How many types of bats live in California?+
California is home to at least 24 bat species, making it one of the most bat-rich states in the U.S. The most widespread include the Mexican free-tailed bat, big brown bat, and pallid bat. Several species are less common or listed as sensitive, so knowing the common ones first helps narrow identification. In California, bat sightings usually improve when you slow down and match your first stop to the most useful ID markers and likely lookalikes. Use thestate wildlife huband theroute guideto narrow your first area, then check access, weather, and distance before you settle in. A short walk with one clear viewing plan often beats covering too much ground, especially when habitat changes fast from open edges to brush, wetlands, timber, shoreline, or neighborhood cover.
2. What are the best field marks to identify California bats?+
Focus on size, ear shape, and flight style. Small bats (3-5 inch wingspan) like the western pipistrelle have erratic, fluttery flight. Medium bats (10-14 inch wingspan) like the big brown bat fly straight and fast. Large bats (14-17 inch wingspan) like the pallid bat have distinct large ears and a slow, maneuverable flight. Fur color varies from gray to reddish. In dim light, ear position and size are your fastest ID clues. If the ears are short and hidden in fur, you're likely looking at a free-tailed bat or big brown bat. Long, upright ears signal a myotis (little brown bat or similar) or a pallid bat. Flight silhouette matters too: Mexican free-tailed bats have a straight, fast trajectory, while little brown bats weave and dart.
3. Where in California are bats most often seen?+
Bats are most often noticed near water sources: rivers, lakes, and reservoirs, especially in lowland regions like the Central Valley and coastal areas. Bridges and old buildings in urban areas also host colonies. In mountain areas, look near forest edges and meadows at dusk. See ourstate animal guidefor the next step.
4. What is the best season for bat sightings in California?+
Spring through fall (March to October) is primetime. Bats are most active after warm days, with peak activity in late summer when pups are weaned. Winter bat activity is minimal except in mild coastal areas. The best time of evening is 30 minutes after sunset.
5. Which California bats are most easily confused with each other?+
The big brown bat and Mexican free-tailed bat look similar in flight but the free-tailed bat has a tail that extends beyond the tail membrane, and its flight is faster and more erratic. The pallid bat's large ears (over half the head length) separate it from all others. The hoary bat has a distinctive frosted appearance and is rarely seen. When identifying in the field, silhouette matters as much as detail. Free-tailed bats often hunt high and fast over open areas. Big brown bats patrol lower, more methodically. Pallid bats hover and flutter more slowly, sometimes snatching prey from the ground. These flight patterns narrow the field quickly.
6. How can I attract bats to my yard in California?+
Install a bat house on a pole or building, facing south or southeast, at least 10 feet high. Water features like small ponds or birdbaths also draw insects, which attract bats. Avoid pesticides to keep insect prey abundant. Native plants that attract nocturnal insects help too.
7. Which California bat species are rarest or hardest to find?+
The western red bat, spotted bat, and fringed myotis are among the trickiest to encounter. The spotted bat is striking (white spots, huge ears) but rare and prefers high desert canyons. The western red bat is solitary and hides in oak trees, making it elusive despite its beauty. The fringed myotis has short, stubby ears and a fringe of hairs on its tail membrane, but it is uncommon in coastal regions and more likely in interior valleys and mountains. These species are not endangered but are infrequently reported, so finding one is a special sighting.
8. How do I tell myotis bats apart from each other in California?+
California's myotis group includes the little brown bat, western small-footed bat, and Yuma myotis. They are tricky because they look similar: all are small, dark, with short ears tucked into fur. The little brown bat is the most common and strong. The western small-footed bat is even smaller and paler. The Yuma myotis prefers water sources and is smaller than the little brown bat. In the field, size and ear length help: little brown bats are stockier and have longer ears that are more prominent. The Yuma myotis has a darker face. Without a hand net, these can be challenging to separate, but knowing they all prefer different microhabitats helps: little brown bats roost in attics and caves across California; Yuma myotis favor low water sources; western small-footed bats prefer rocky canyons and cliff faces.
9. Where can I find more identification help?+
Check ourbat hub pagefor species comparisons and range maps. For California-specific resources, visit theCalifornia wildlife page. Local bat groups often host guided evening walks. For field-friendly gear, explorebat-themed shirts and stickersto support your interest.
10. What bat-related gear do you recommend for field trips?+
A good headlamp with red light mode keeps bats undisturbed. A compact field notebook and binoculars help with identification. For a fun reminder of your outings, check out these items: ### Cute Bat Sticker []() A durable vinyl sticker perfect for water bottles or field journals. Check Price and Availability ### Bat Animal Short-Sleeve T-Shirt []() Comfortable cotton tee with a realistic bat graphic. Check Price and Availability ### Baby Bat Cartoon T-Shirt []() A fun, lightweight tee for casual bat appreciation. Check Price and Availability ### Cute Bat T-Shirt []() A simple, adorable design for bat lovers of all ages. Check Price and Availability
Keep exploring
More places to see bat
More wildlife in California