Massachusetts is home to a diverse array of bat species, each playing a vital role in controlling insect populations and maintaining ecological balance. Whether you’re a wildlife enthusiast, a homeowner concerned about bats in your attic, or just curious about these nocturnal creatures, understanding the different types of bats in the state can help you appreciate their importance and coexistence. This list covers the most common and notable bat species found in Massachusetts, providing specific details about their appearance, habits, and conservation status to help you identify and understand them better.
1. Little Brown Bat (Myotis lucifugus)
The Little Brown Bat is one of the most widespread and recognizable bats in Massachusetts. It measures about 3.5 to 4.5 inches in length with a wingspan of up to 11 inches, featuring a glossy brown fur that darkens at the tips. Known for roosting in buildings, tree cavities, and under bark, these bats are crucial for insect control, consuming up to 1,000 insects per hour. Their populations have declined due to white-nose syndrome, making them a conservation priority.
2. Big Brown Bat (Eptesicus fuscus)
The Big Brown Bat is larger than many other local species, with a wingspan of about 13-16 inches and a robust body approximately 4.3 to 5 inches long. Its fur is dark brown to almost black, and it is often seen flying near buildings or under bridges during summer. Known for its adaptability, the Big Brown Bat readily roosts in structures like attics and barns and feeds mainly on moths and beetles, making it a beneficial species for pest control.
3. Eastern Red Bat (Lasiurus borealis)
The Eastern Red Bat is distinguished by its vibrant reddish-orange fur, which covers its entire body, including the tail. It measures about 3.5 to 4 inches in length with a wingspan of around 11-13 inches. These solitary bats prefer to roost in tree foliage during summer, often hanging from branches, and are known for their impressive migratory journeys to wintering grounds in the south. Their striking appearance makes them one of the most visually distinctive bats in Massachusetts.
4. Silver-haired Bat (Lasionycteris noctivagans)
Recognizable by its silvery-gray, long, and shaggy fur, the Silver-haired Bat is a striking species that measures about 3.5 to 4 inches long with a wingspan of approximately 10-11 inches. It favors roosting in tree cavities, under bark, or in buildings during migration seasons. Active mostly at dusk and dawn, this species plays a key role in controlling moth populations and migrates south for the winter.
5. Eastern Small-Footed Bat (Myotis leibii)
This small bat, measuring just 2.8 to 3.3 inches in length, is notable for its tiny feet and dark fur with a slightly reddish hue. It prefers rocky crevices, caves, and forested areas in Massachusetts, often roosting under bark or within rock outcroppings. Its limited range and specialized habitat make it a species of concern, and it is vital to protect its rocky habitats.
6. Northern Long-Eared Bat (Myotis septentrionalis)
The Northern Long-Eared Bat is about 3.5 to 4 inches long, with a wingspan of 9-11 inches. It is characterized by long, flexible ears and a generally brown fur that can appear slightly lighter on the belly. This species prefers woodland roosts like tree cavities and is highly susceptible to white-nose syndrome, leading to significant population declines. Protecting mature forests is critical for its conservation.
7. Eastern Pipistrelle (Perimyotis subflavus)
The Eastern Pipistrelle, also known as the Tri-colored Bat, is a small species measuring around 3 inches in length with a wingspan of 8-10 inches. Its fur features three distinct color bands—brown, tan, and yellow—making it visually unique. It roosts in tree cavities, buildings, and under bark, feeding primarily on small insects, and is important for pest management in agricultural areas.
8. Hoary Bat (Lasiurus cinereus)
The Hoary Bat is one of the largest Massachusetts bats, with a wingspan of up to 16 inches and fur that is thick, frosted with silvery-gray tips. It is often seen in open woodlands and along forest edges during migration, where it hunts for moths and beetles. Its impressive size and striking appearance make it a standout species, though it is less commonly encountered than others.
9. Eastern Small-Footed Bat (Myotis leibii)
This tiny bat, measuring just 2.8 to 3.3 inches in length, is notable for its tiny feet and dark fur with a slightly reddish hue. It prefers rocky crevices, caves, and forested areas in Massachusetts, often roosting under bark or within rock outcroppings. Its limited range and specialized habitat make it a species of concern, and it is vital to protect its rocky habitats.
10. Tricolored Bat (Perimyotis subflavus)
The Tricolored Bat, often confused with the Eastern Pipistrelle, is distinguished by its tri-colored fur—brown at the base, yellow in the middle, and brown at the tips. It is about 3 inches long with a wingspan of 8-10 inches and roosts in tree cavities and buildings. Its diet consists primarily of small moths and beetles, and it plays a significant role in controlling pest insects in rural and suburban areas.
How to Choose
When selecting or trying to identify a bat species in Massachusetts, consider factors such as size, fur color, habitat preference, and local activity periods. Size and coloration are often the easiest visual clues, but understanding their preferred roosting sites—such as buildings, trees, or caves—can help narrow down the species. Additionally, noting the time of year and activity patterns, like migration or hibernation, can guide accurate identification. Conservation status and local regulations should also influence how you interact with or protect these bats.
Frequently Asked Questions
1. Are all bats in Massachusetts protected by law?
Most native bat species are protected under state and federal laws due to declining populations, particularly because of white-nose syndrome. It’s illegal to harm or disturb hibernating or maternity colonies without proper permits.
2. How can I tell if I have bats in my attic?
Signs include droppings that look like small, dark pellets, a strong musky odor, and seeing bats or hearing high-pitched squeaks at dusk or dawn. It’s best to consult a wildlife professional for proper identification and removal.
3. Do bats in Massachusetts hibernate during winter?
Yes, most Massachusetts bats hibernate in caves, mines, or buildings from late fall to early spring, depending on the species and winter severity.
4. What should I do if I find a bat in my home?
Avoid handling it directly; contact a licensed wildlife rehabilitator or pest control professional experienced in bat exclusion to safely remove and relocate the animal.
5. Why are bats important to Massachusetts ecosystems?
They help control insect populations, including mosquitoes and agricultural pests, and contribute to pollination and seed dispersal in some habitats.
Final Thoughts
Massachusetts hosts a diverse and fascinating range of bat species, each with unique characteristics and ecological roles. Understanding these bats enhances our appreciation of their importance and informs better conservation practices. Whether you’re observing them in the wild, protecting their habitats, or managing bat encounters responsibly, recognizing the variety of bats in the state helps foster coexistence and preserves these vital creatures for generations to come.
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