Flight without sonar

An ancient bat fossil suggests that bats were flying before they were echolocating.

Bats are famous for their ability to use sound to "see." The technique, called echolocation, involves making high-pitched sounds that bounce off objects and return to the animal. On the basis of the pattern of sound that comes back, a bat gets a good picture of what's out there.

More than one-fifth of mammal species alive today are bats. And most bats use echolocation to find prey and avoid bumping into things as they fly. But bats didn't always have such supersensory skills, say scientists who have found a fossil of one of the world's most ancient bats.

This ancient bat, called Onychonycteris finneyi, could fly but probably not echolocate.
Royal Ontario Museum
The new find feeds an old debate: Which came first for bats—flying or echolocation?

Scientists from the American Museum of Natural History in New York City found the fossil in western Wyoming. The bones come from a bat called Onychonycteris finneyi, which lived about 52.5 million years ago. The animal's wingspan measured 30 centimeters (12 inches) wide. It was about the size of a cardinal bird.

The ancient bat looked different from modern bats. For one thing, it had claws on all five digits of its front limbs. Living bats (and previously studied fossil bats), on the other hand, have claws on no more than two digits of each front limb.

O. finneyi's wings were shorter and broader than those of other bats. And the part of the wing that stretched between the bat's fingers was relatively small. Modern species that are built this way have an odd way of flying: They take turns gliding and flapping their wings.

This flying style is clumsy, but it saves energy. And it might represent the evolutionary transition from gliding to true flying. What's more, some of O. finneyi's other features resemble those of animals that live in trees but don't fly, such as sloths and lemurs. Together, these traits suggest that O. finneyi belonged to one of the most primitive groups of bats.

Previously, scientists had found fossils from six other species of bats that lived between 54 million and 50 million years ago. All six appear to have been able to both fly and echolocate.

O. finneyi, it is now clear, could definitely fly. But the well-preserved fossils reveal the primitive bat's inner ear was small, which suggests that it could not echolocate. This means, scientists think, that bats developed the ability to fly before they developed the ability to echolocate.

"This is a really big find, a huge piece of the [evolutionary] puzzle," says Emma C. Teeling, a paleontologist at University College Dublin.

Going Deeper:

Perkins, Sid. 2008. Flying deaf? Earliest bats probably didn't echolocate. Science News 173(Feb. 16):99. Available at

Sohn, Emily. 2008. Hearing whales. Science News for Kids (Feb. 13). Available at

_. 2007. How to fly like a bat. Science News for Kids (May 9). Available at

Webb, Sarah. 2006. Echoes of hunting. Science News for Kids (April 26). Available at


BatsRule!/\^._.^/\Help Save WildLife

Articles,67,Audio,15,Backyard,10,Barbed Wire,21,Bat Art,34,Bat Books,70,Bat Box,26,Bat Clothing,14,Bat Issues,500,Bats for Children,26,Bats for the Home,61,Electrocution,7,Events,33,info on bats,455,Jackie Sparrow,22,Microbats,410,Misc,64,Netting,32,Newsletter,4,Promoting,124,Rehab,60,Rehab 2011,1,Rehab 2012,19,Rehab 2013,10,Rehab 2014,6,Rehab 2015,103,Rehab 2016,99,Rehab 2017,10,Release Cage,2,RESCUE,60,Rescue 2012,3,RESCUE 2013,11,RESCUE 2014,8,RESCUE 2015,24,Rescue 2016,12,RESCUE 2017,1,Rob Mies,11,Shooting,2,Vegetation,23,Video,421,Virus,110,WebSites-Bat,46,
Megabats and Microbats: Flight without sonar
Flight without sonar
Flight without sonar
Megabats and Microbats
Loaded All Posts Not found any posts VIEW ALL Readmore Reply Cancel reply Delete By Home PAGES POSTS View All RECOMMENDED FOR YOU LABEL ARCHIVE SEARCH ALL POSTS Not found any post match with your request Back Home Sunday Monday Tuesday Wednesday Thursday Friday Saturday Sun Mon Tue Wed Thu Fri Sat January February March April May June July August September October November December Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec just now 1 minute ago $$1$$ minutes ago 1 hour ago $$1$$ hours ago Yesterday $$1$$ days ago $$1$$ weeks ago more than 5 weeks ago Followers Follow THIS CONTENT IS PREMIUM Please share to unlock Copy All Code Select All Code All codes were copied to your clipboard Can not copy the codes / texts, please press [CTRL]+[C] (or CMD+C with Mac) to copy