Methods and apparatus for attracting rats

1. A method of attracting rats, the method comprising:

a. placing a device capable of producing an acoustic signal in an area determined to have a need for capturing and/or killing rats, wherein the device is contained in, placed adjacent to, or integrated with a trap capable of capturing or killing an attracted rat; and

b. causing the device to emit an acoustic signal comprising a playback recording or synthetic generation of multi-frequency vocalizations of rats, wherein the acoustic signal has a modulated duration and intensity, wherein the acoustic signal comprises a first ultrasonic frequency component and a second ultrasonic frequency component, and wherein

the first ultrasonic frequency component comprises an ultrasonic frequency in the range of 21-24 kHz; and

the second ultrasonic frequency component comprises an ultrasonic frequency in the range of 60-96 kHz;

c. attracting a rat; and

d. capturing or killing the attracted rat.

2. The method of claim 1 , wherein the device comprises a processor programmed to generate the acoustic signal, and wherein the processor comprises an electronically activatable microchip.

3. The method of claim 1 , wherein in step (a) the device is placed in an area containing a rodenticide.

4. The method of claim 1 , wherein step (b) comprises modulating one or more of the frequencies of the first ultrasonic frequency component and a second ultrasonic frequency component.

5. The method of claim 4 , wherein step (b) further comprises providing intermittent silences between emissions of acoustic signals.

6. The method of claim 5 , wherein step (b) further comprises altering durations of the intermittent silences between emissions of the acoustic signals.

7. The method of claim 1 , wherein step (a) further comprises placing in the area a chemical stimulus to enhance the attraction of rats.

8. The method of claim 7 , wherein the chemical stimulus comprises one or more stimuli selected from the group consisting of 2-hydroxy-3-methylcyclopent-2-en-1-one, butyric acid, 2,3-butadione, 3-methylbutanal, 5-methyl-(E)-2-hepten-4-one, λ-octalactone, 4-hydroxy-2,5-dimethylfuran-3-one, 5-methyl-4-heptanone, dimethyltrisulfide, nonanoic acid, decanoic (capric) acid, dodecanoic (lauric) acid, tetradecanoic (myristic) acid, hexadecanoic (palmitic) acid, (Z)-octadec-9-enoic (oleic) acid, octadecanoic (stearic) acid, lactic acid, glycerol, lard and cracklings, oat flour, rice flour, wheat bran, fructose, soy lecithin, safflower oil, salmon oil, and compounds derived from bedding contaminated by the urine and feces of female mice and/or rats.

9. The method of claim 7 , wherein the chemical stimulus comprises 2-hydroxy-3-methylcyclopent-2-en-1-one, butyric acid, 2,3-butadione, 3-methylbutanal, 5-methyl-(E)-2-hepten-4-one, and γ-octalactone.

10. The method of claim 7 , wherein the chemical stimulus comprises a heat-treated, cereal-based composition comprising a cereal flour, a cereal bran, a gelling agent, a sugar, an oil, an emulsifier and a humectant.

11. The method of claim 7 , wherein the chemical stimulus comprises dimethyltrisulfide.

12. The method of claim 1 , wherein the acoustic signal further comprises a sonic frequency component.

13. The method of claim 12 , wherein the sonic frequency component is in the range of 1.8-7.5 kHz.

14. The method of claim 12 , wherein the sonic frequency component is in the range of 8-12 kHz.

15. The method of claim 12 , wherein the sonic frequency component is in the range of 15-20 kHz.

16. An apparatus comprising:

a. a processor programmed to generate an acoustic signal comprising a playback recording or synthetic generation of multi-frequency vocalizations of rats, wherein the acoustic signal comprises a first ultrasonic frequency component and a second ultrasonic frequency component and has a modulated duration and intensity, wherein

the first ultrasonic frequency component comprises an ultrasonic frequency in the range of 21-24 kHz; and

the second ultrasonic frequency component comprises an ultrasonic frequency in the range of 60-96 kHz;

b. an amplifier for amplifying the acoustic signal; and

c. a speaker for emitting the amplified acoustic signal.

17. The method of claim 1 , wherein the acoustic signal further comprises a third ultrasonic frequency component in the range of 40-50 kHz.

18. The apparatus of claim 16 , wherein the acoustic signal further comprises a third ultrasonic frequency component in the range of 40-50 kHz.