hi i"ve pre baited a crow and jackdaw trap last week my trap has 2 ground funnels placed the door on it fryday night saturday morning i went and had a look i"d cault 30 birds 1 hit mostly jackdaws , crows , some rooks and a magpie , ive tried ladder traps but have found some birds get out mainly jackdaws but with the funnels they seem to work better sunday morning id cault 4 jays and a crow nothing on monday so ive moved my trap to another site . im using cut maize as bait . also have you tried eggs in your larson trap they work quiet well in atracting crow as well as magpies good luck