Bats: Legions of the Night

As Halloween approaches, bat-themed decorations swarm store windows and homes, often in the company of black cats and other creatures synonymous with mystery and dread. Though bats have become symbolic of our spookiest holiday, they are benevolent, diverse, and fascinating throughout the year.

© David McChesney

© David McChesney

One out of every five mammal species on earth is a bat. They may look like flying mice, but bats are more closely related to the carnivores and hoofed animals. They are the only mammals capable of true flight, and their wings consist of four elongated fingers with skin stretched between them.

Nine species live in Massachusetts. All eat insects and hunt mainly from dusk to dawn. To find prey in low light, they make high-pitched sounds that bounce off their surroundings and return to their ears. By analyzing the way these sounds echo off of insects, they can discover their target’s size, location, and direction of travel. A single bat can eat 600 moths and other insects in an hour.

Since prey is scarce in the winter, Massachusetts bats migrate south or hibernate. Five species overwinter in cold wet caves. In recent years these habitats have hosted a fungus—probably introduced from Europe—that causes a deadly illness called white-nose syndrome. As a result, these five cave-dwelling bats are listed as endangered in Massachusetts.

Scientists have successfully treated some bats for the disease. But there’s much more work to do. Help protect bats by making sure that you don’t disturb their summer and winter roosts. Also, support the conservation of natural areas that keep insect populations in balance, allowing bats to continue flying our skies during the witching hour and beyond.

Learn more about bats at

Updated September 2021

2 thoughts on “Bats: Legions of the Night

  1. Morgan Keohane

    I am an elementary school librarian and my Kindergarten students are currently studying bats. Many of them start off thinking that all bats suck blood and turn into vampires at night, but by the end of their study learn to respect these incredible creatures! Thank you for highlighting the importance of having bats in our region and ensuring they are protected.

  2. Sonja Wadman

    The Waltham Land Trust has a bat house that was built by local Girl Scouts and needs a home! It is recommended that this small brown dwelling suitable for two bat families be attached at least 15 feet from the ground onto a structure such as a barn (not to a tree), ideally facing an open stretch of land. Please email me at [email protected] if you have a suggested location. Thanks!


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