Fruit Bats (band) Bats had begun to evolve into a band with the inclusion of I Rowboat members Dan Strack and Brian Belval and in 2001, their debut record Echolocation was released on Califone's imprint, Perishable Records. Tours followed with the likes of Modest Mouse and The Shins. Fruit Bats signed with Sub Pop in 2002 and have released four albums with the label including "Mouthfuls" in 2003, "Spelled in Bones" in 2005, "The Ruminant Band" in 2009 and "Tripper" in 2011. Johnson also joined The Shins in 2009. Their song "Humbug Mountain Song" spurred new fan activity. In an interview with "Reverb
Animal echolocation other, or both structures. An FM sweep is a broadband signal – that is, it contains a downward sweep through a range of frequencies. A CF tone is a narrowband signal: the sound stays constant at one frequency throughout its duration. Echolocation calls have been measured at intensities anywhere between 60 and 140 decibels. Certain microbat species can modify their call intensity mid-call, lowering the intensity as they approach objects that reflect sound strongly. This prevents the returning echo from deafening the bat. High-intensity calls such as those from aerial-hawking bats (133 dB) are adaptive to hunting in open skies.