blind as a …

A changing climate could hamper the ability of some bat species to hunt effectively using sound, according to a new study. Bats calling at low frequencies will hear echoes from an object further away than bats calling at high frequencies, says study co-author Holger Goerlitz, a biologist at the Max Planck Institute for Ornithology in Germany.

One thing is clear: global warming will impact the pure physics of sound that bats use to echolocate.
National Geographic, 10 Dec 2012