Bats can see about as well as humans.
However, they are nocturnal --- which means they are active at night --- and think about how well you can see at night.
Without a light, can you see a mosquito? You might feel it bite you, but you sure wouldn't see it coming. Without a flashlight, can you find a moth fluttering its wings? We sure can't.
But bats still have to hunt, even when they can't see in the dark. So they use something called echolocation.
Echolocation is a high-frequency system similar to sonar --- like what a fisherman might use to see where fish are at underwater. Bats call in a pitch too high for adult humans to hear as they fly and listen to the returning echoes to build a sound map of their surroundings.
The animals can tell how far away something is by how long it takes the echo to return.
Different species of bats have different frequency ranges for echolocation, depending on their environment and what prey they eat. The species can be identified by its call using a bat detector. In fact, bats can be classified as shouting bats and whispering bats. Common bats in northwest Iowa --- big brown and little brown bats --- are shouting bats, because they make sounds at 110 decibels, about the same as a smoke alarm, because they hunt in open spaces. Whisperers usually hunt in more enclosed areas, such as forests.
Remember though, we can't hear bats hunt. Bat sounds, like from this big brown bat, that can be heard by humans are not echolocation sounds. Echolocation is a frequency too high for humans to hear.
Iowa has nine species of bats (you can read more about them here) and some of them hibernate while others migrate, and some migrate to hibernate. Iowa’s two most common bats, and those that you would find in Dickinson County, are the little brown bat (Myotis lucifugus) and the big brown bat (Eptesicus fuscus). Both Read More »Read More
Bats are a hot topic around Halloween. (We love bats — read about how they use echolocation here.) And we love crafts that are both nature-related and fit into the season, so today we tested out a new bat craft. It’s simple, great for all ages and utilizes things you already have around the house. Read More »Read More
Mammals are usually the creatures that garner oohs and aahs when people see them on hikes, in their yards or even in zoos and conservation centers. They’re usually furry and cuddly with adorable eyes. (Some are ugly though — read about them here) Iowa has 57 different common mammal species, and some are charismatic while Read More »Read More
“Where is the hedgehog?” or “What is in the cage below the salamanders?” These are two questions we often get at the Dickinson County Nature Center, because what is in the cage below the salamanders in our lower level is an African pygmy hedgehog named Honey. And Honey is usually buried beneath one of her Read More »Read More