Trained bees, so laboratory. On the side, it's always worth googling the paper in question and poking around a bit. This is at the top of google result for the

Trained bees, so laboratory. On the side, it's always worth googling the paper in question and poking around a bit. This is at the top of google result for the paper title: http://phys.org/pdf287643238.pdf http://phys.org/pdf287643238.pdf