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Protecting Bats from Extinction

Nick Tchankoshvili


Bats have survived for millions of years but now they are declining rapidly because of:

  • loss of habitat and foraging areas
  • pesticides in their favorite food — insects
  • extermination
  • human activity such as hunting or cave exploring

December 2001


Townsend’s big-eared bat, Corynorhinus townsendii, a fruit bat. Source: Nevada Bureau of Land Management.

Bats are grouped into two suborders: microbats and megabats.


Bats are not only fascinating mammals but they are of great importance in nature. Bats have been on this planet for over 50-60 million years. There are between 950 to 1,000 species, living on all continents except Antarctica. The small microbats eat mostly insects whereas megabats, the larger-sized variety, feed mostly on fruit. Sometimes, both small and large species eat flowers and drink nectar.

Over 100 bat species are at high risk.
Pesticides intended for insects kill bats.
  • increased use of pesticides, both in agriculture and in the treatment of building materials against pests, which in turn poisons the bats who consume them3

  • disturbance of colonies, particularly by people exploring caves in winter; human presence disturbs hybernating bats, causing bats to lose their energy and leading to exhaustion and death

  • extermination — millions of bats are killed due to myths, superstitions and misinformation

  • hunting — a large number of bats are used for commercial purposes, such as sales to museums, biomedical research institutions, or in some Third World countries as food In the last few decades bat populations have been declining at alarming rates worldwide. Bats remain the most endangered land mammal in the United States.1 The International Union for Conservation of Nature and Natural Resources listed 53 bat species as endangered and at least that many more species at risk in 2000.2

Bats on the decline

Humans are the main cause of bat declines and extinctions. The causes for decline include:

  • habitat loss through such activities as deforestation, elimination of foraging areas, roost and cave destruction

Reasons for protection

Without bats, we’d be overwhelmed with night insects.

Balance in nature
Bats are the primary predators of night-flying insects, playing a vital role in maintaining their balance in nature. One bat eats 1/3 of its body weight and is able to catch 600 mosquitoes in one hour. Their instinct to live in colonies ensures that large numbers of bats will live or relocate to areas where there are lots of insects, keeping insect populations down. And different bat species hunt at different heights, preying on different kinds of insects. The big-sized bats eat various moths and worms that are harmful to agriculture and forestry. The small-sized bats eat mosquitoes and other double-winged insects - - carriers of diseases such as malaria and leischnamia. This is one reason to protect all species of bats.

Many tropical fruits are pollinated by bats.

Helping the world’s flora
Bats that eat fruit or flowers disperse seeds and pollinate flowers of more than 500 species of tropical trees and shrubs. With their help, humans are supplied with a large crop of bananas, cashews, avocados, balsa wood and tequila. If it were not for bats, the harvest of such tropical fruit as bananas and pineapples would decrease by 60%.

Bat droppings are nature’s fertilizer.

Natural fertilizers
Guano, or bat droppings, is the highest quality natural fertilizer. It contains much more nitrogen and phosphate than other natural or artificial fertilizers. In addition, guano in caves supports entire ecosystems of unique organisms, including bacteria useful in detoxifying industrial wastes and producing antibiotics.

Bats are not dangerous animals.

Bat myths

  • Bats do not have a high incidence of rabies (less than 0.5%). But if a bat allows you to approach, it is probably sick and should be avoided.
  • Bats flying over your head are not trying to attack you. They are catching insects that are attracted to you.
  • Vampire bats prefer farm animals such as cattle or birds to humans.
  • And the last and most important: bats never get tangled in people’s hair!
There are 37 known species of bats in Europe.

Bats in Georgia

The Caucasus Mountains of Transcaucasia attract researchers because of their unique landscapes, flora and fauna. Located between the Black and Caspian Seas, they are home to a particularly diverse array of bats, a result of south, east and west faunal migrations. Of the 37 species of bats observed in Europe, about 29 can be found in the small territory of Georgia.4

Bats have not been seriously studied in Georgia.

The status and population trends of bats in Georgia are unknown.5 The reason for the lack of information is that they are very complicated animals to study. As well, bats have never been popular subjects for special study and accordingly there has never been any Georgian scientist researching them. I am sure that local extinction of some species has already occurred.

The author’s research took him to over 400 bat shelters.

So, I decided to study bats in my country, Georgia.

  • I investigated different bat shelters at different altitudes for a whole year, at night and by day. I investigated 498 shelters and found bat colonies in 444. Some of the colonies were very small.
  • I also studied different biotopes to discover as many species as I could. For identification I applied 6 different criteria. I found only 8 species. Two of them are on the red list of endangered species. My research suggested that three more were at risk.
Some people kill bats based on unfounded fears.

In Georgia, the low biodiversity of bat species is due, on the one hand, to urbanization which reduces their hunting areas and, on the other hand, to the extermination of these animals by people. Some people willfully exterminate bats, often because of a disturbing cultural myth. Some religious leaders have convinced people that bats have an evil origin. Others destroy bat roosts during the restoration of old buildings. In Georgia, pesticides are not a problem for bats, since no pesticides are used in timber treatment, and very seldom pesticides are used in agriculture.5

Few people know that tree hollows are bat homes.

The most difficult task in my research was to find forest species. Georgia has an energy crisis and forests are being cut down for fuel without sufficient conservation management policies in place. There is a widespread misunderstanding that cutting trees with hollows doesn’t harm the environment. In reality, many bats live in tree hollows. That’s why it is very important for Georgia to protect old trees with hollows, because these endangered species live here.

Public education will dispel myths.
Conclusion: Individual efforts can boost bat populations.

Bat conservation

More than 50% of bats do not survive infancy. A female usually has only one offspring a year, so population recovery is slow. Declining populations can only be stopped through tough measures. Public education is also important, especially in developing countries, through such efforts as financing conservation-oriented studies and distribution of scientific literature about bats.

I hope more people will become interested in bats and take action to protect them. For example, one way of helping some species of bats is to build an artificial hollow to shelter bat colonies. Compared to natural hollows, the artificial version has less parasites and humidity. This makes the conditions better for survival, especially for newborn bats.

Bats are creatures of the dark but it doesn’t mean that we should leave their problems in the dark as well.

Nick Tchankoshvili is a student at Tbilisi State Medical University, Georgia. As a high school senior, he won first prize at the 12th European Union Contest for Young Scientists, Amsterdam, for his study of bats in Georgia. His scientific interests include EEG and intelligence, sustainable development, and wildlife.

Protecting Bats from Extinction

BioScience Article

“White-nose Syndrome Threatens Bats.”
According to Jeffrey Cohn, scientists from federal and state wildlife agencies, universities, and conservation groups have launched a major research effort to understand, identify, and counter a mysterious ailment that has killed perhaps a half-million insect-eating bats in the northeastern United States during the last two winters (BioScience, December 2008). Free to read.

Bats in Europe

Learn about bats in this part of the world and efforts to protect them.

Bats in Australia

Click any area on this Australian map to find out about bats in that area.

Bats in the United Kingdom

Information and bat conservation efforts in the U.K.

Bat management in the U.S.

Facts about bats and examples of bat management efforts in the U.S.

Fieldguide to U.S. Bats

This National Wildlife Federation site provides photos and information about numerous American bat species.

Bat Conservation International

This organization provides information about bats worldwide.

The Lubee Foundation

This organization is dedicated to the conservation of threatened and endangered species of Old World fruit bats. Click on “programs” in the menu on home page if you are a graduate student or scientist interested in helping with their research efforts.

Read a book

  • » Bats in Question: The Smithsonian Answer Book by Don E. Wilson (Smithsonian Institution Press, 1997) is a fact book about bats that will interest both youngsters and adults alike
  • » The Bat House Builder’s Handbook by Merlin D. Tuttle is “based on research conducted by BCI, contains the results from the first-of-its-kind study on bat house occupancy, includes plans, frequently asked bat house questions, and information about bats most likely to use bat houses.” (University of Texas Press; revised edition 2001)

Bat conservation workshops and field trips

Attend Bat Conservation International workshops or join their staff on field trips to learn how you can protect bats. These programs are available worldwide. (click on “get involved” on the home page)

Build a bat house

Instructions for building a bat house.

Batworld Sanctuary

The organization offers several ways for you to help conserve bats, from adopting a bat to what to do if you find an injured bat.

For teachers: class activities

A listing of lessons and other online activities about bats.

Bats Do It

In this lab students will determine how far away from a wall humans need to be in order to hear both a sound and its echo. They will also learn how bats locate objects using echolocation. Middle School.

  1. Tuttle, Merlin D. 1995. “Saving North America’s beleaguered bats.” National Geographic, August, 36-57.
  2. “Summary statistics for globally threatened species.” 2001 IUCN Red List of Threatened Species website. Accessed 12/01. 11/22/09 No longer available.
  3. “International bat conservation in Europe.” United Nations Environment Programme (UNEP) - Eurobats website. Accessed 12/01.
  4. “Agreement on the Conservation of Bats in Europe: Attachment to the report on implementation of the Agreement in Georgia.” March 2001. United Nations Environment Programme (UNEP) - Eurobats website. Accessed 12/01 (URL no longer live).
  5. “Agreement on the Conservation of Bats in Europe: The report on implementation of the Agreement in Georgia.” March 2001. United Nations Environment Programme (UNEP) - Eurobats website. Accessed 12/01 (URL no longer live).

General References:

  • » John Altringham, Tom McOwat, and Lucy Hammond. Bats: Biology and Behavior. Oxford University Press, 1998.
  • » Thomas H. Kunz and Paul A. Racey. Bat Biology and Conservation. Smithsonian Institution Press, 1998.


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