How can anyone in Louisiana think that bats are scary?
Despite what you see in the movies, these fascinating flying mammals wouldn’t hurt a fly! Well, technically, they would hurt a fly, or a mosquito, or a moth. But other than that, bats are harmless. 🙂
Did you know there are 10 kinds of bats in Louisiana?
It’s hard to believe the diversity and amount of species that can be found in Louisiana! But, unfortunately, when you see a bat, it’s typically pretty difficult to determine which kind of bat it is. These nocturnal creatures fly incredibly fast and are only active at night.
#1. Big Brown Bat
- Eptesicus fuscus
- Larger-sized bat with around a 12-inch wingspan.
- Brown fur with black ears, wings, and feet. Wings are hairless.
Big Brown Bats are widespread all over Louisiana.
If you look, you’ll find these bats inside caves, tunnels, or other human structures.
Big Brown Bat Range Map
This nocturnal bat primarily eats insects, especially ones that fly at night. However, their preference is to eat beetles.
The Cucumber Beetle is their favorite, which benefits farmers because these insects are terrible pests for agriculture. Many farmers in Louisiana even use bat boxes to attract Big Brown Bats to their property!
Though rabies is common in all bats, research has shown the disease is rarer in this species.
The reason for this fact is that many Big Brown Bats have immunity to rabies. Interestingly, researchers discovered that these rabies antibodies get passed down from generation to generation!
#2. Hoary Bat
- Lasiurus cinereus
- Brown hair with grayish-white tips. Wings and belly are brown and hairless, with a wingspan approximately 15.5 inches.
- Males are almost double the size of females.
You’ll typically find Hoary Bats roosting on trees in woodland forests. But occasionally, they will go into caves to stay with other bats.
Hoary Bat Range Map
This species prefers to hunt for prey while flying over wide-open areas or lakes. Hoary Bats hunt alone and enjoy eating moths. They’re known to travel up to 24 miles in a single night to gather food!
Though the Hoary Bat is not endangered, it does suffer a loss in numbers because of wind turbines. Hoarys’ migrate each year back and forth from North America to Central America, and it’s thought that they confuse the wind turbine with being a tree as they seek a place to rest. As you can imagine, these bats meet a horrible death.
#3. Silver-haired Bat
- Lasionycteris noctivagans
- Medium-sized bat, flathead, and the upper part of the tail are covered in thick fur.
- Mostly black all over with white tips on hairs, with a wingspan that is approximately 11.5 inches.
The Silver-haired Bat is known to fly more slowly than other bats in Louisiana.
Look for Silver-haired Bats in forests inside tree cavities or bark crevices. They’ve also been known to seek shelter in outbuildings.
Silver-haired Bat Range Map
Silver-haired Bats hunt for soft-bodied insects, such as moths. Interestingly, they also eat a lot of spiders. They accomplish this feat by foraging low to the ground to find food, unlike many other bats.
Unfortunately, rabies occurs more often in this species when compared to other bats.
#4. Eastern Red Bat
- Lasiurus borealis
- Medium-sized tree bat with thick, long fur. Ears are short and round. Wings are long, pointed, and have a wingspan of approximately 13 inches.
- Males have distinctive rusty red-colored fur, and females have more of a soft shade of red.
- Both have white patches of fur on their shoulder.
Eastern Red Bats like to roost in trees in Louisiana.
I love their red fur, which I think makes them look cute!
Eastern Red Bat Range Map
These bats are relatively fast flyers with good maneuverability. They are insectivorous, which means they prey primarily on different insects, with their favorite being moths.
Unlike most bats that only produce one offspring, Eastern Red Bats have three pups in a litter.
Eastern Red Bats have few predators. However, sometimes hawks, aggressive Blue Jays, and crows will attack them. This bat is also killed by flying into cars or wind turbines. Unfortunately, this species has the second-highest mortality rate from wind turbines.
#5. Tricolored Bat
- Perimyotis subflavus
- Small bat with blond hair on the chest. Their wingspan is approximately 8 to 10 inches.
- The “tricolor” name comes from the coloration of the three distinct bands of hairs on their back: dark gray on the bottom, yellowish-brown in the middle, and brown or reddish-brown on top.
- Formerly known as the Eastern Pipistrelle.
The Tricolored Bat is the smallest in Louisiana!
Despite their small stature, Tricolored Bats can live to be 15 years old, which is a long time for bats! And interestingly, Tricolored Bats mate in the fall, but the female stores the sperm and doesn’t become pregnant until spring.
Tricolored Bat Range Map
Did you know the Tricolored Bat’s natural predators include many birds of prey, snakes, skunks, other bats, and Northern Leopard Frogs? It’s crazy to think of a frog eating a bat, but it shows how tiny these mammals are!
Related Article: The 15 Types of Frogs in Louisiana!
Tricolored Bats used to be considered one of the most common bats around. But, unfortunately, their numbers have been decimated by White-nose Syndrome. It’s thought that 70% of their population has succumbed to this fungal disease.
#6. Evening Bat
- Nycticeius humeralis
- Smaller bat with a prominent dog-like jaw.
- The majority are dark brown with black muzzle, ears, legs, and wings, but some are a lighter brown. Their wingspan is approximately 10.5 inches.
The Evening Bat doesn’t enter or even hibernate in caves, which is good news because that helps them avoid White-nose syndrome, a terrible disease that has killed millions of bats over the years.
But the bad news is:
They have a shorter life span than other bats in Louisiana.
Evening Bat Range Map
Most only live for 4 years, but some are lucky enough to make it to 6 years.
Look for Evening Bats roosting in structures, including tree cavities, under bark, in Spanish moss, and buildings. They eat a wide variety of insects, including beetles, moths, winged ants, and flies.
#7. Mexican Free-tailed Bat
- Tadarida brasiliensis
- Smaller bat with gray fur on front and back, face, ears, wings, and legs are light black.
- Ears are short and rounded with lines inside and ruffled on the bottom.
- Wings are elongated and narrow with pointed tips. Their wingspan is approximately 12 to 14 inches.
The Mexican Free-tailed Bat is the fastest in Louisiana!
Their long narrow wings help make them quick and have direct flight patterns while catching their flying prey. They also use echolocation to help to navigate in the night sky.
Mexican Free-tailed Bat Range Map
This species primarily roosts in caves, but they can be found in any structure with an opening and dark hiding place.
Mexican Free-tailed Bats have glands in their skin that cover their body. These glands leave a scent that other bats can smell, so they know that this roost is only for the Mexican Free-tailed Bats.
#8. Seminole Bat
- Lasiurus seminolus
- Smaller bat with round and short ears. Wingspan is approximately 8 to 10 inches.
- Darker red fur with white-tipped hairs on their back
Seminole Bats are mainly found in forests in Louisiana.
Seminole Bat Range Map
In particular, they’re closely associated with forests that have Spanish moss since that is where they roost during spring and winter. Professional moss gatherers often find these bats inside clumps.
Even though Seminole Bats seem to be common, not much research has been done on them. For example, scientists have no idea about their average lifespan.
These bats are insectivores and feed primarily on ants, bees, wasps, beetles, and moths. Interestingly, they take advantage of street lights that attract lots of bugs.
#9. Rafinesque’s Big-eared Bat
- Corynorhinus rafinesquii
- The fur is gray on the back and white on the belly. Face and ears are pinkish browns.
- Wings are dark brown, and ears are very long, measuring over an inch (hence their name).
- Wingspan is approximately 10 to 12 inches.
The Rafinesque’s Big-eared Bat lives in a variety of places. They prefer mature forests but will also go into abandoned buildings or under bridges.
Rafinesque’s Big-eared Bat Range Map
This nocturnal bat is insectivorous and feeds on mosquitoes, beetles, and flies. Their diet consists of over 90% moths, which are located using echolocation.
Luckily, the White-nose Syndrome fungus, which kills many species of bats, doesn’t affect the Rafinesque’s Big-eared Bat.
#10. Southeastern Myotis
- Myotis austroriparius
- The fur varies from bright orange-brown to gray. The wingspan is approximately 9 to 11 inches.
- Females are often more brightly colored than males.
Southeastern Myotis prefer to live in bottomland hardwood forests in Louisiana.
Look for them near water, as this is where they like to roost and search for food. The diet of the Southeastern Myotis consists mainly of caddisflies.
Southeastern Myotis Range Map
The Southeastern Myotis are a crucial food source for the Barred Owl during nesting season. Interesting, when it’s not the nesting season, the owls tend to leave the bats alone.
This species is unique compared to other bats in Louisiana because females primarily have twins. Most other bats only have one offspring.
Do you need additional help identifying bats in Louisiana?
If so, this field guide should be able to help you.
Which of these bats have you seen before in Louisiana?
Leave a comment below!