More Spectacular than Spooky: Fun Facts about Bats in Ontario

October 27th, 2020

Bats are the only freely flying mammals on the planet. Pictured is a little brown bat (Myotis lucifugus) flying through a local forest. The little brown bat is the most common species of bat in North America and has been most negatively impacted by white-nose syndrome, a fungal disease affecting hibernating bats. The fungus causes the bats to become more active than usual during hibernation and burn up the fat they need to survive the winter. (Photo: Laura Scott)

This GreenUP column is written by guest authors Ryan Holt and Laura Scott. Ryan and Laura are graduate students at Trent University studying habitat selection in bats.

With Halloween coming up, we thought it’d be a good time to talk about bats. Bats are often portrayed in popular culture as servants of darkness, the evil pals of Dracula, and as dangerous pests. Humans seem to have created many reasons to both hate and fear our furry flying cousins.

Bats are mysterious. They occupy a dark, aerial world that’s hidden to most of us. That mystery, however, is not nearly as fascinating and wonderful as the truth about bats. Bats lead very interesting lives. Here are some neat facts about bats:

  • Bats are more closely related to dogs and cats than to mice and rats. Woof!
  • As blind as a bat? No! Bats can see both with their eyes and with their ears. Bats have eyesight that is thought to be better than humans, especially in the dark. They also use echolocation (sonar) to see structure. This helps them forage for tiny insects in the night sky.
  • Bats are the only flying mammal, and bat wings are made from elongated finger bones just like our fingers.
  • There are over 1,300 species of bat in the world, making them one of the most diverse groups of mammals.
  • Ontario has eight different species of bats. Three of these species migrate south from Ontario: red bats, hoary bats, and silver-haired bats. Some migrate as far south as Central America! Five bat species hibernate in Ontario during the winter: little brown bats, eastern small-footed bats, big brown bats, northern long-eared bats, and tri-coloured bats.
  • Hibernating bats can spend the entire winter without eating and can cool down their bodies to match surrounding temperatures, slowing their metabolism.
  • The bats that can be found in Ontario live on average for five years. However, some individuals have been documented living upwards of 30-40 years!
  • A mother bat typically only has one baby bat per year. Baby bats are called pups. When born, pups weigh one quarter of their mother’s weight. Pups are able to fly and hunt for insects by one month of age. Mothers will also raise pups together in a nursery – it takes a community to raise a bat!

The eastern small-footed bat (Myotis leibii) is the smallest species of bat in Ontario. They are about the size of your thumb and weigh only 4 to 7 grams as adults – that’s between a nickel and a loonie! These bats are unique in that they roost on the ground, under rocks in sunny locations. (Photo: Laura Scott)

Beyond these amazing facts, bats are also important to our shared environment. Bats save farmers upwards of three billion dollars a year in pest control due to their consumption of adult moths and beetles. The larva of these insects are major agricultural pests.

These days, however, many of the bats that call our forests and cities home are in trouble. Due to an introduced fungal pathogen known as white-nose syndrome, hibernating bats in North America have faced population declines. Some locations in Canada have lost over 95 percent of individuals.

This dramatic reduction in population, combined with ongoing threats like habitat loss and climate change, means it is even more important for us to protect bats. Here are some concrete ways we can make bats’ lives easier and help them in their time of need:

Create Foraging Habitat

Enjoy gardening? Let your flowers do the work. Planting a biodiverse garden of night-blooming plants can attract nocturnal pollinators that also serve as a food source for bats.

Some plant suggestions include: evening primrose, four-o’clock, goldenrod, phlox, fleabane, and cardinal flower.

Avoid using pesticides or herbicides. These can reduce insect populations, removing much-needed food sources for bats. Pesticides and herbicides can also become toxic for wildlife that eat insects, including bats.

A female big brown bat (Eptesicus fuscus). The second-largest bat in Ontario, big brown bats weigh from 10 to 21 grams with a wingspan of 32 to 35 centimetres. Big brown bats eat a variety of insects, including agricultural pests like cucumber beetles. They can be found throughout North America, the Caribbean, and northern South America. (Photo: Ryan Holt)

Create Roosting Habitat

Many bats roost in tree hollows or under tree bark. Where safe, leave dead trees as natural roosting habitat for bats.

Bat houses are a great addition to the home and cottage! A bat house can provide safe space for a nursery roost while also helping to cut down on pest insects.

A bat puppet at the GreenUP Store testing out a bat box by the Hope Mill. (Photo: Leif Einarson.)

The GreenUP Store sells bat houses made by the Hope Mill, and the Avant-Garden Shop sells bat boxes and build-your-own kits. You can also check out The Bat House Builder’s Handbook online for details on how to build your own!

A well-placed bat house can welcome bats to forage around your home or cottage, helping to cut down on pest insects. Bat houses should ideally be placed in direct sunlight, at least 4 to 7 metres high, and 6 metres away from obstacles. Experimenting by installing two different bat houses (lighter vs. darker, in this photo) can help you figure out what the bats in your area prefer. (Photo: Laura Scott)


Found a bat in your home?

Bats use echolocation, so they can find their own way out if you open windows/doors, remove screening, and turn off the lights.

If you find a bat that seems wounded, isn’t flying, or is behaving unusually, do not touch it. Call the Rabies Information Line at the Ontario Ministry of Natural Resources and Forestry: 888-574-6656

Bats, along with racoons and skunks, can carry rabies. Only one percent of bats carry rabies, but due to the high fatality risk of this disease, close contact should be taken seriously. If you do come into contact with a bat, contact your family doctor, local emergency room, or local public health facility immediately.

A male little brown bat (Myotis lucifugus). Little brown bats can travel hundreds of kilometres to mate at caves and mines in late summer and fall. Females give birth to a single pup the following June. (Photo: Ryan Holt)

Seeing bats during the day?

If you see bats crawling around on the ground or hanging out on exposed walls or trees during the day, email info.mnrfscience@ontario.ca and provide this information: location, date/time, observations of the bat (what was it doing?), and if you saw a band on its arm/wing.

Found a dead bat?

Contact the Canadian Wildlife Health Cooperative at on-nu@cwhc-rcsf.ca or 1-866-673-4781

What to do if you have an unwanted bat roost?

If bats have taken up unwanted residence in your home, contact a professional who can humanely exclude bats. It is important that bats are excluded safely, and at an appropriate time of year, avoiding maternity season when mothers and pups could be harmed. It’s also important that new habitat is provided if possible, like a bat house.

Half of Ontario’s bats are provincially endangered and we must protect them. Endangered or threatened species cannot be harassed, captured, or killed without authorization from the Ontario Ministry of Resources and Forestry. It is important to contact a professional who has this authorization.

As the days get shorter, and Halloween rolls around, let’s celebrate how fascinating bats are in fact, not only in fantastic portrayals. Bats are a critical part of our local ecosystem, and they’re pretty cute too! Take some time to learn more with the resources listed here. Happy Halloween!

Toronto Zoo Native Bat Conservation Program


Bat Conservation International


Bat World Sanctuary


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