2.1. Capturing free-flying bees

For many behavioural studies, free-flying foragers need to be taken into the laboratory. Foragers can be caught when they leave the hive (Friedrich et al., 2004; Matsumoto et al., 2012) or when they return to the hive (Page et al., 1998; Scheiner et al., 1999, 2001b, 2002, 2003; Tsuruda and Page, 2009).