Bats are not, in fact, blind, but they depend much more on echolocation than vision for navigation and prey capture. They obtain information about the surrounding world by emitting sonar chirps and then listening for the echoes. Their brains are highly specialized for this process, and some of these specializations appear in the superior colliculus. In bats, the retinal projection occupies only a thin zone just beneath the surface, but there are extensive inputs from auditory areas, and outputs to motor areas capable of orienting the ears, head, or body. Echoes coming from different directions activate neurons at different locations in the collicular layers, and activation of collicular neurons influences the chirps that the bats emit. Thus, there is a strong case that the superior colliculus performs the same sorts of functions for the auditory-guided behaviors of bats that it performs for the visual-guided behaviors of other species.
Bats are usually classified into two main groups: Microchiroptera (the most numerous, and commonly found throughout the world), and Megachiroptera (fruit bats, found in Asia, Africa and Australasia). With one exception, Megabats do not echolocate, and rely on a developed sense of vision to navigate. The visual receptive fields of neurons in the superior colliculus in these animals form a precise map of the retina, similar to that found in cats and primates.
Other articles related to "bats, bat":
... Taylor slumped in 1960, hitting only.207 in 150 at-bats ... he hit.238 with eight home runs and 23 RBI in 235 at-bats (89 games) ... He began the 1962 season with the Cubs, hitting.133 in 15 at-bats with them ...
... In 182 at-bats he hit.291 with seven home runs and 38 RBI ... with three home runs and 12 RBI in 80 at-bats ... career when he hit.302 with 37 home runs and 115 RBI in 500 at-bats ...
... and the Wye Valley are known areas for supporting the United Kingdom bat populations, and there are several Sites of Special Scientific Interest notified in England and in Wales for their protection ... Significant numbers of the rarer bats (Lesser Horseshoe Bat and Greater Horseshoe Bat) are recorded in Lady Park Wood ... The Wye Valley and Forest of Dean Bat Sites/ Safleoedd Ystlumod Dyffryn Gwy a Fforest y Ddena are designated a Special Area of Conservation ...
... August 21, 1989 (age 23) Guarenas, Venezuela Bats Switch Throws Right Ehire Enrique (Palma) Adrianza (born August 21, 1989) is a minor league baseball shortstop currently on the San Francisco Giants ... in 2006, playing for the DSL Giants and hitting.156 in 122 at-bats ... he played again for the DSL Giants, improving his batting average to.241 in 249 at-bats, stealing 23 bases in 29 attempts ...
Famous quotes containing the word bats:
“The moon is my mother. She is not sweet like Mary.
Her blue garments unloose small bats and owls.”
—Sylvia Plath (19321963)
“A woman drew her long black hair out tight
And fiddled whisper music on those strings
And bats with baby faces in the violet light
Whistled, and beat their wings
And crawled head downward down a blackened wall....”
—T.S. (Thomas Stearns)
“Bats have no bankers and they do not drink
and cannot be arrested and pay no tax
and, in general, bats have it made.”
—John Berryman (19141972)