This phenomenon does not occur in the whole valley but only in a well-defined strip, 1.5 km long and 200 mts. wide. Invariably the birds come in only from the north and attempts at placing the lights on the southern side of the ride to attract the birds have failed. Another fact is that no long distance migratory bird gets attracted to the light traps. Some common resident birds like grouse, hornbills and imperial pigeons do not get caught at Jatinga.