basically , any of a variety of or combination of sounds ( which may include high frequency sounds inaudible to man , etc . ), with or without additional sensory stimuli , is / are used to attract the attention of and thus incite rabid animals ( e . g ., carnivores or bats ) to attack the sound source . however , only nonbiological sound ( neither actual , recorded or simulated animal sounds ) should be used to avoid attracting normal , healthy animals . the nonbiological sound has proved most effective if divided into short sound bursts of about one - third second duration , separated by equal intervals of silence . the nonbiological sound source is positioned so that the attacking animal will be restrained and / or euthanized during its effort to attack the source . whereas the use of sensory stimuli , especially nonbiological sound , to attract specifically rabid animals , comprises this invention , any of many known and existing restraint and / or destruction systems and devices may be used for actual trapping or destruction of the rabid animal . combined with nonbiological sound sources to lure rabid animals , example well - known traps for bats and for carnivores follow . bats are sometimes captured in a “ harp trap ”, such as the one illustrated in fig1 and 2 , after the trap is placed where bats normally fly , such as in cave entrances . the flying bats encounter vertically - stretched wires ( or plastic lines ) 5 , of too small a diameter for the bats to detect with their echolocation sonar systems , and they slide down the wires through a smooth - sided hopper 7 , over which they cannot crawl upward to escape , and thence downward into a holding cage or euthanizing chamber 8 . in order to attract and capture specifically rabid bats , a nonbiological sound source ( e . g ., a batteryoperated smoke alarm in this example ) 9 has been attached to the “ harp trap ” and positioned behind the wires to attract attack - prone rabid bats , which are captured as they try to attack the sound source . combined with any effective sound lure , the hopper and cage alone or even a smooth - sided bucket or similar container or sticky , adhesive material could be utilized in restraining and / or euthanizing rabid bats , though less effectively . two or more wire - bearing frames 6 and 15 or entire traps may be placed together in tandem , separated by one to three inches , to increase the trap &# 39 ; s effectiveness , as the occasional bat may pass through one barrier and escape capture . this is shown in fig5 . similarly , as indicated by the dashed lines in fig6 , two or more sets of wires 5 and 16 may be installed in tandem within a single frame to increase trap effectiveness . carnivores , such as dogs , cats , skunks , or foxes , are routinely captured unharmed in boxlike “ live traps ”, such as the one illustrated in fig3 and 4 , by placing a bait ( food , scent , etc .) deep in the boxlike interior . the animal enters through the door opening 10 , proceeding inward toward the bait , and in so doing trips any of a variety of releases 11 whereupon the door 12 closes , trapping the animal inside . in order to attract and restrain specifically rabid animals , the foregoing bait is replaced by a nonbiologic sound source , in this example housed within a protective cover ( e . g ., a metal bowl ) 13 , positioned on the outside of the deep end mesh wall 14 of the trap . sound is directed through the mesh 14 continuing through the trap outward through the open door . as a rabid animal enters the trap and tries to attack the sound source , it trips the release 11 , whereupon the door 12 closes behind it . while certain preferred embodiments of the invention have been specifically disclosed , it should be understood that the invention is not limited thereto as many variations will be readily apparent to those skilled in the art , and the invention is to be given its broadest possible interpretation within the terms of the following claims .