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Flocks , which may number upwards of 1,000 birds , are constantly on the move from one food source to another . After delays of 20 minutes , 1 hour , and 24 hours , the rats were returned to the cage with one of the former objects and a new object . We regularly perform the test at each of our twelve programs in four of New York City 's ' s five boroughs , and we give demonstrations of the technique at many AIDS service organizations in the New York area . While in evidential mode , the unit reports results to two digits , masking the third decimal . The case of private messages can be handled as a sidebar with just two participants , similar to the example in section Section 9.4.1 , but rather than using audio within the sidebar , " Alice " could add an additional text based media stream to the sidebar .