10/25/2026
For todays , you might want to speak a little quieter. They have big ears (all the better to hear you with), a funny nose (all the better to smell you with), and sharp fangs (all the better to eat…bugs with)! Today, we’re talking about the Rafinesque big eared bat! 👂🦇
Rafinesque's big-eared bat, sometimes known as the southeastern big-eared bat, is a species of vesper bat native to the southeastern United States. Vesper bats are a family of micro bats, meaning this bat is small, around 7.5–10 cm. That makes them about the size of a peach or a grapefruit. What they lack in stature, they make up for in ears! Rafinesque bat ears are 2.7 to 3.7 cm long, making it one third of their total body length.
These use these ears to be sneaky, even fooling researchers. Rafinesque’s big-eared bats are considered difficult to monitor because the low intensity of their echolocation calls means they are rarely detected by the ultrasonic detectors. The challenge of recording their echolocation calls has given them the nickname “whisper bats”.
Even though it might be a challenge, we have learned some fun things about this bat. Like It is one of the few bat species in Florida that will target and pick insects directly off vegetation or the ground, a behavior called “gleaning”. Unlike most bats, which are crepuscular (meaning only active at twilight and/or dawn), Rafinesque’s big-eared bat is fully nocturnal, actively flying and hunting from sunset to sunrise. During this time they pick off night time bugs, like moths, mosquitoes, beetles, and flies.
Rafinesque’s big-eared bats like to roost in a variety of places. Tree roosts may be in living or dead trees but are usually quite large, abandoned buildings, under bridges, in wells, and in caves. Unless you’re living in a large, scary, stony castle, and wearing a cape while running around at night, you probably won't run into these guys. However, if you do, remember it is illegal to remove bats from structures or to otherwise handle them directly in the state of Florida.