The inside view from colony 3 (see here for construction) explains why bees learn to get out through the exit tubes, but enter through the inside tubes!
A look from inside
PREPARATORY ACTION FOR MONITORING OF ENVIRONMENTAL POLLUTION USING HONEY BEES
PREPARATORY ACTION FOR MONITORING OF ENVIRONMENTAL POLLUTION USING HONEY BEES
The inside view from colony 3 (see here for construction) explains why bees learn to get out through the exit tubes, but enter through the inside tubes!