OK In Health - Science Corner

Going to Bat for our Furry Flying Friends - July 2017

By David Suzuki, Vancouver, BC

Canada Bats

Bats are fascinating creatures, and they’re more important than many people realize. A bat can eat more than 1,000 insects in an hour – up to 6,000 a night. Some bats consume bugs that attack agricultural crops and some feast on pests like gnats and mosquitoes. The 25 million free-tailed bats in Bracken Cave, Texas, eat more than 200 tonnes of insects every summer night!

Some bats are also pollinators. Without the services of the Mexican long-tongued bat, the agave plant, from which we get tequila, might not survive. So, right off the bat (sorry), if you like tequila but not mosquito bites, you should view bats as your friends.

There’s more. Because of their role in insect control, pollination, and seed dispersal, bats are a key part of the interconnected web of life that makes growing food possible. Even their nitrogen-rich poop makes good fertilizer. Bats do so much for us. Maybe it’s time we returned the favour – especially considering the dire threats many bat populations face.

But some people are afraid of bats. Much of this is based on misconceptions about the world’s only flying mammal: bats will drink your blood, give you rabies, or get stuck in your hair. Although the three species of vampire bats in Central and South America do feed on blood, they prefer to drink from cows, goats, pigs, and chickens. And rabies is rare in bats. Fewer than 40 people have contracted rabies from wild bats over the past 50 years. And despite expressions like “blind as a bat”, bats can actually see quite well, and have the added advantage of echolocation for navigating, so they’re unlikely to fly into you or your hair.

Many of the 1,200 known species of bats, representing a quarter of all mammal species, are in trouble. And we humans deserve much of the blame. About half the world’s bat species are threatened or endangered, mainly due to habitat destruction, pollution, and direct harm by humans.

Other threats are more mysterious. Bats in New Brunswick, Nova Scotia, and other parts of Eastern North America are being wiped out by white-nose syndrome. A fungus causes the bats to warm and wake from hibernation in cold weather before insects are available, so they starve or die of exposure. Scientists are trying to learn why the fungus affects the bats this way, and where it comes from, but they have yet to find conclusive answers. They believe it could be an invasive species of fungus, imported from Europe through human activity, to which North American bats haven’t built up immunity. A committee of experts has recommended that Canada’s environment minister issue an emergency order to protect the bats under the Species at Risk Act, but the government has yet to respond. One of the greatest fears is that the fungus could spread to other bat populations, and maybe even jump the Rocky Mountains, unless we act quickly.

New Brunswick Zoologist Don McAlpine told CBC News that, because they provide natural pest control, “the loss of bats could add billions of dollars to the cost of producing food.”

Besides protecting bats through legislation, people can also help by building them homes. Different bats require different types of houses, but all should be south-facing and mounted at least four metres off the ground. This will help bats in the face of increasing habitat loss, and may also discourage them from roosting in your home or garage.

We also need to have proper environmental assessments before wind turbines are installed, to reduce harm to bats and minimize other environmental impacts. Scientists suspect that dead bats found near wind-power installations (most of which are migratory species) were killed by air pressure drops rather than contact with blades. With proper environmental reviews and more research about the causes of death and ways to reduce or prevent it, we can enjoy the benefits of clean wind power without putting bats at risk.

Like so many other living things, bats illustrate how everything in nature is interconnected and that harming one plant or animal or ecosystem has cascading effects that touch us all. If we don’t do everything we can to help bats, we’ll all suffer – and not just from mosquito bites!



Fungus wipes out East Coast bats:


Bat facts:



New Brunswick Zoologist Don McAlpine told CBC:


Bat boxes:


Emergency order to protect bats:


Organization for Bat Conservation:


Bats and wind turbines:


Air pressure drops and wind power bat deaths:



David SuzukiDavid's Bio: Dr. David Suzuki is a scientist, broadcaster, author, and chair of the David Suzuki Foundation. He is Companion to the Order of Canada and a recipient of UNESCO's Kalinga Prize for science, the United Nations Environment Program medal, the 2009 Right Livelihood Award, and Global 500. Dr. Suzuki is Professor Emeritus at the University of British Columbia in Vancouver and holds 24 honorary degrees from universities around the world. He is familiar to television audiences as host of the long-running CBC television program The Nature of Things, and to radio audiences as the original host of CBC Radio's Quirks and Quarks, as well as the acclaimed series It's a Matter of Survival and From Naked Ape to Superspecies. His written work includes more than 47 books. Dr. Suzuki lives with his wife, Dr. Tara Cullis, and family in Vancouver, B.C. - David Suzuki Website

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