
Bats: Friend or Foe?
By Julie Roderick, Wildlife Photographer
Do
you believe in the several misconceptions about bats? Do you believe they
are pests as opposed to beneficial? Do all bats "go for blood?" Do they
fly into your hair because they are blind?
There are many myths and legends about bats. Some are half-truths
expanded upon by lack of true understanding, some are cultural beliefs
and others are false and most likely the result of wild imaginations
and movies. The fact is that most bats are actually quite harmless
and are very important for humans and the environment.
Bats are indicators of a healthy environment and play a vital role
in the cycle of life. They disperse seeds, pollinate plants and some
eat insects. West Nile Virus has made us think twice about mosquito
bites and how to rid your home and yards of mosquito nesting grounds.
Bats are a natural advantage in fighting mosquito populations and the
spread of disease. Bats are sensitive to high pollution and pesticide
levels and can warn us of potential environmental issues.
Bats are curious, intelligent and uniquely impressive in so many different ways:
- Bats are the ONLY flying mammals.
- Bats can live for over 30 years - but are adversely affected by geographic location, lifestyle, human pollution and destruction of their natural habitats, which considerably lessen their chances of living that long.
- Bats are closely related to primates, which is our order!
- Bats have a highly developed and accurate navigational system called echolocation.
- Bats have remained the same on the evolution scale for millions of years, unlike any other mammal on earth. In fact, there are no documented cases of anyone ever finding a bat fossil that does not look very much like the bat we have today. This means bats are most likely much older than we ever imagined. Currently, they are on the order of 60 million years old.
Here are a few myths and facts to clarify the truth about bats.
| Myth: |
"Bats are blind and will get caught in your hair" |
| Fact: |
"First, bats are not blind. As a matter of fact, some bats have
eyesight three times better than a human's. Second, a bat's echolocation
ability is very precise, able to detect an object as fine as a single
strand of human hair even in total darkness. Chances are very slight
that a bat, with such accurate echolocation capabilities, would make
a mistake and get tangled in your hair. Finally, bats do not make
nests, they roost. Therefore, a bat will not nest - in human hair
or anything else." -Stokes Beginner's Guide to Bats |
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| Myth: |
"Bats attack humans" |
| Fact: |
"Bats are very small and gentle animals; they will not attack people.
Remember, we are very large to a bat and they are afraid of us" --Stokes
Beginner's Guide to Bats |
| |
| Myth: |
"Vampire Bats live in the United States and drink human blood" |
| Fact: |
"Vampire Bats live in Central America, South America and Southern
Mexico. They rarely drink the blood of humans, preferring the blood
of chickens, cows, and pigs." -Stokes Beginner's Guide to Bats |
Here are a few common questions and answers found in an excellent resource
book called Bats in Question, The Smithsonian Answer Book by
Don E. Wilson to further clarify the facts about bats.
ARE BATS A THREAT TO HUMANS?
"Bats are not a threat to humans in the sense of mounting a direct
attack or flying into your hair. With the rare exception of vampire
bats in Latin America, they will almost never approach a human with
anything other than curiosity in mind. They can, however, harbor
diseases that can affect humans."
DO BATS CARRY DISEASE?
"Diseased bats can theoretically be found anywhere. That is why
bats that are out of place, acting strangely, or unafraid of humans
should be avoided. However, the odds of you being killed by a bat-borne
disease are much less than one in a million, and you face greater
danger from honeybee stings or bathtub falls than from any sort of
health risk from bats."
"The most serious disease bats can carry is rabies, and the
potential threat of rabies argues against handling bats, particularly
if they are acting strangely or let you approach without trying to
escape. This said, it should be stressed that bats are no more likely
to harbor rabies than many other mammals, and much less so than some
species. In the wild only a fraction of a percent of bats are rabid.
Bats are much more likely to transmit rabies to other bats than to other
species of mammals. In most areas where rabies outbreaks occur, the
strain of the virus has been traced back to dogs, cats, raccoons, skunks,
or other mammals."
"Another disease occasionally associated with bats is Histoplasmosis,
caused by the fungus Histoplasma capsulatum. It is possible for humans
to become infected with this disease by breathing in the spores, which
are sometimes found in large, dry, dusty accumulations of mass bird or
bat droppings. Avoidance of these situations should virtually eliminate
the danger of contracting this disease. If it is necessary for you to
remove large accumulations of dry guano from an attic or other enclosed
area, using a respirator should protect you from this risk."
WHY DO BATS LIKE BUILDINGS?
"Humans have created havoc with the environment of most other kinds
of animals, but there are a few species that have adapted comfortably to
the ways of people. Several species of bats have taken to buildings as
if they own the places. Attics, barns, outbuildings, and the like mimic
the ancient snag or cave roosts that were probably the ancestral refuges
of these species. Such environments provide the requisite dark, relatively
temperature-stable refuge from predators that most species of bats require
for a daytime retreat. The fact that these quarters are shared with a family
of Homo sapiens below is of little consequence to the bats. All they need
is a tiny entrance and exit hole and freedom from disturbance."
"To avoid a large colony of bats using your attic, the only solution is
to block all potential entrances with bird netting. Of course this needs
to be done when the bats are not present. The best time to do repairs is
during the winter, when the bats will likely have moved to cooler quarters
to hibernate."
"If your bats are year round residents, you will need to do the repairs
at night, when they are foraging. This will also require ensuring that
there are no young left behind so that you do not inadvertently trap them
inside. In North America, June, July, and August are the most likely times
for young to be in the roost. Mount a bat roost on a pole or the side of a
building an alternative to your attic."
WHAT SHOULD I DO IF I FIND A SICK BAT?
"A sick bat should be left strictly alone. Call you local animal control
office to deal with the animal. If you have to remove such an animal from
the house, use thick gloves and make sure the bat is placed where it will
not be found by pets or other animals. Bats that are flying normally are
unlikely to be sick, but animals that are on the ground or unable to fly
should be assumed to be sick and treated with caution."
WHAT GOOD ARE BATS?
"For temperate zone bats, the main value is insect control. These
little insectivores put away enormous quantities of insects every summer
night, all over the northern and southern hemispheres. Bats' efforts at
pest control are also a boon for orchardists and farmers. In addition,
the guano that bats produce is a valuable fertilizer, in both natural
ecosystems and agricultural systems."
"These insectivores have the added benefit of serving as indicators
of health of the ecosystem. The free-tailed bat declines of the 1960's
were a wake-up call to the dangers of long-lived pesticides in the environment.
Such pollutions signals are going to be increasingly important in our
world of ever-expanding human populations and economic development."
"In the tropics bats are even more valuable to the functioning of
natural and agricultural environments. They serve as pollinators and
seed dispersal agents for hundreds, and probably thousands, of species
of tropical plants. Many plants have adapted to the benefits of this
service by opening flowers and producing nectar only at night to attract
the bats. Others produce fruits whose seeds are distributed well away
from the parent plants by flying bats."
"These ecosystem services are vitally important to virtually every
major habitat type on earth. Bats are missing only from polar ecosystems
and a few small, remote oceanic islands. The loss of significant numbers
of species of bats would have far-reaching consequences for the other animals
and the plants that share their communities."
"Recent advances in pharmacological studies have suggested potentially
valuable uses for the anticoagulant compounds found in vampire bats' saliva.
Prospecting for new drugs in an important growth industry in many parts of
the developing world, and finding such a potentially valuable resource in an
animal that has been severely persecuted as a pest is an interesting object
lesson in why we should protect all our natural resources."
"Beyond
all these practical reasons for protecting a valuable resource, bats are
part of our natural heritage, to be enjoyed for purely aesthetic reasons.
Furthermore, surely these remarkable products of millions of years of
evolution have every right to exist for their own sake, regardless of
any value system imposed by humans."
It is my hope that people take the time to learn about bats as they are
truly remarkable and need to be redeemed from the merciless persecution
so undeservingly placed upon them by humans. I encourage people to invite
bats into their world. The Birds, Bugs & Beyond Nature Store has a wide
variety of bat roosting shelters and will be adding more bat literature
to the library in the Spring.
Reference material provided by:
Bats in Question, The Smithsonian Answer Book by Don E. Wilson
Stokes Beginner's Guide to Bats by Kim Williams, Rob Mies, Donald & Lillian Stokes
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