Indiana bat facts for kids
Quick facts for kids Indiana bat |
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| Conservation status | |
Scientific classification  |
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| Kingdom: | Animalia |
| Phylum: | Chordata |
| Class: | Mammalia |
| Order: | Chiroptera |
| Family: | Vespertilionidae |
| Genus: | Myotis |
| Species: |
M. sodalis
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| Binomial name | |
| Myotis sodalis Miller & Allen, 1928
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| Approximate range of the Indiana bat | |
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The Indiana bat (Myotis sodalis) is a small to medium-sized mouse-eared bat found in North America. These bats live mostly in the Southern and Midwestern parts of the United States. Sadly, they are an endangered species, meaning their numbers have dropped a lot.
Indiana bats are usually grey, black, or chestnut brown. They are about 1.2 to 2.0 inches long and weigh between 4.5 and 9.5 grams. They look a lot like the more common little brown bat. However, you can tell them apart by their feet size, the length of their toe hairs, their pink lips, and a small bump called a keel on their calcar (a cartilage spur near their ankle).
These bats live in forests with hardwood trees or a mix of hardwood and pine trees. They are often found in older forests and on farmland, especially near forests, crop fields, and grasslands. Indiana bats are insectivores, which means they eat insects. They catch flying insects like moths, beetles, mosquitoes, and midges.
The Indiana bat population has faced a serious decline. Experts estimate that their numbers have fallen by more than 50% in the last 10 years. This decline is why the U.S. Fish and Wildlife Service has listed them as an endangered species.
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Discovering the Indiana Bat
The Indiana bat's body, from head to tail, measures about 4.1 to 4.9 centimeters. They weigh around 8 grams. It can be tricky to tell them apart from other bat species, especially the little brown bat (Myotis lucifugus). You need to look closely at their feet, the length of the hairs on their toes, and a special feature called a keel on their calcar.
Indiana bats usually live for 5 to 9 years. Some have even lived up to 12 years. Their fur can be black to chestnut brown, with a lighter grey or cinnamon belly. A helpful clue for identification is their pink lips, unlike other common bats that have brown hair and black lips.
Where Indiana Bats Live
During the summer, Indiana bats spread out across the eastern United States. But in winter, they gather in large groups to hibernate in just a few caves. Since around 1975, their population has dropped by about 50%. A count in 1985 estimated about 244,000 Indiana bats hibernating. About 23% of these bats hibernate in caves in Indiana.
Indiana bats only use caves in winter for hibernation. They need very specific conditions in these caves, especially stable, cool temperatures. These temperatures help them slow down their bodies and save their fat reserves. They hibernate in large, tight clusters, sometimes with thousands of bats together.
These bats eat only flying insects at night. A single colony of bats can eat millions of insects every night! The Indiana bat's home range overlaps with the Gray Bat (Myotis grisescens), which is also an endangered species.
Why Indiana Bats Are Endangered
The Indiana bat was first listed as an endangered species in 1967. This was because their populations were rapidly decreasing across their entire range. Several factors have caused this decline. These include people disturbing their colonies, the use of pesticides, and the loss of their summer homes due to forests being cut down.
Since 1973, the Indiana bat has been protected under the Endangered Species Act. They are also protected by the Federal Cave Resources Protection Act of 1988. This law helps protect the caves and mines where they hibernate on federal lands. In 2013, Bat Conservation International recognized the Indiana bat as a top priority for conservation worldwide.
Current Dangers for Indiana Bats
Indiana bat populations in the northeastern United States are facing a huge threat from white-nose syndrome. This disease has spread quickly and is one of the most damaging wildlife diseases in recent history. By the end of 2011, this disease had killed between 5.7 and 6.7 million bats in the United States since it was first discovered in 2007. For example, at least 15,662 Indiana bats died from white-nose syndrome in 2008 alone. In Pennsylvania, an estimated 95% of all cave bats have died from this disease.
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Sadly, some Indiana bats have also been harmed by people. In one instance, individuals illegally entered a cave and harmed many hibernating Indiana bats. This act was a serious violation of laws protecting endangered species. Such actions cause great harm to these vulnerable animals and lead to legal consequences for those involved. Protecting endangered species is very important, and disturbing their habitats or harming them is against the law.
Wind turbines also pose a threat to Indiana bats. Bats can be killed by flying into the spinning blades or by changes in air pressure near the turbines. As of 2013, a few Indiana bat deaths have been confirmed due to wind turbines.
Other human activities have also contributed to the decline of Indiana bat populations. These include using pesticides, disturbing bats in their hibernation sites, and building improper gates on caves. Climate change and the development of agricultural lands also play a role. As a result, the Indiana bat population across the country fell by 57% between 1960 and 2001.
Life Cycle and Reproduction
Indiana bats start arriving at their winter homes, called hibernacula (caves and mines), in late August. Most return in September. Females usually go into hibernation soon after arriving. Males, however, stay active until late autumn to mate with females who arrive later. Most Indiana bats hibernate from October to April. In the northern parts of their range, they might hibernate from September to May.
While some Indiana bats hibernate alone, most are found in very dense clusters. These clusters can have thousands of bats packed together.
Spring migration begins as early as late March. However, most Indiana bats don't leave their winter hibernacula until late April or early May. Females are usually the first to emerge. Most males start to emerge in mid-to-late April. Females arrive at their summer locations starting in mid-April. They form summer nursery colonies with up to 100 adult females. Males typically roost alone or in small groups during the summer. Many males stay near their winter hibernacula, while others travel to different areas, similar to where females go.
Females can mate in their first fall, but some wait until their second year. Males become ready to reproduce in their second year. Mating happens in and around the hibernacula in the fall. During this time, Indiana bats participate in a behavior called "swarming." Large numbers of bats fly in and out of caves from sunset to sunrise. Swarming mostly happens from August to September and is an important part of mating.
Fertilization happens at the end of hibernation, and pregnancy lasts about 60 days. Pups are born from late May to early July. Female Indiana bats usually give birth to one pup. Young bats are weaned (stop drinking milk) after 25 to 37 days. They can also fly around this time. Most young bats can fly by early to late July, but sometimes not until early August.
Indiana bats can live for a relatively long time. One Indiana bat was found 20 years after it was first tagged as an adult. Females have been known to live for at least 14 years and 9 months, while males can live for at least 13 years and 10 months.
Indiana Bat Habitat
Indiana bats need specific types of places to live. They are found in hardwood forests throughout most of their range. In the southeastern United States, they also live in mixed hardwood-pine forests. These bats prefer older forests with many hardwood trees.
In summer, Indiana bats use many different tree species for roosting. Common trees include oaks, hickories, ashes, elms, and maples. They often choose dead or dying trees with loose bark. These trees are called snags. They also use some live trees like shagbark hickory, silver maple, and white oak. Shagbark hickories are great for roosting because their bark naturally peels away. Bats usually roost under this loose bark, but sometimes they use tree cavities.
Indiana bats typically spend the winter in caves or mines. They need very specific conditions to survive their 6-month hibernation period. They need stable, cool temperatures, just above freezing, to slow their bodies down and save energy. Caves with multiple entrances often have good airflow, which helps keep the temperatures stable. If a hibernaculum gets too warm, bats can use up their fat reserves too quickly and may not survive the winter.
Bats sometimes fly to different areas within a cave to find the best conditions as winter changes. They are usually loyal to the same hibernation sites year after year. The U.S. Fish and Wildlife Service has identified critical winter habitats for Indiana bats. These include 13 important hibernacula across several states.
What Indiana Bats Eat
Indiana bats eat only flying insects, both from land and water. Their favorite foods include moths, beetles, and mosquitoes and midges. What they eat can change depending on what insects are available, the time of year, and if the female bats are pregnant or nursing. In some areas, they also eat caddisflies, bees, wasps, and ants.
Indiana bats travel from their day roosts to their foraging (hunting) areas each night. They can travel up to 2.6 miles to find food. They often hunt for insects around the tops of trees or over rivers and streams. They prefer to forage in forested wetlands and other woodlands. They usually avoid open agricultural fields and pastures.
Who Preys on Indiana Bats
During hibernation, predators like black rat snakes and northern raccoons might prey on Indiana bats. At other times of the year, raccoons have been seen trying to catch bats as they fly. Skunks, opossums, and feral cats can also be a threat. If Indiana bats fly during the day, they might be caught by hawks. At night, owls can prey on them.
While woodpeckers are not predators, their foraging can disturb roosting bats. They might peel away bark that bats are using, causing the bats to fly out during the day. This can also make the tree unsuitable for future roosting.
The biggest threat to Indiana bats comes from humans. Human disturbance of their habitats and direct harm cause more problems than natural predators. When people enter caves where bats are hibernating, it can wake the bats up. Waking up uses a lot of energy, and if bats wake up too often, they can run out of fat reserves before winter ends, which can lead to death. Human disturbance and habitat loss are the main reasons for their population decline.
In some areas, invasive snakes like Burmese pythons might also prey on Indiana bats.
See also
In Spanish: Murciélago de Indiana para niños
