Queen-laid eggs are positioned at the bottom of the cell. Immediately after oviposition the egg is almost perpendicular to the cell wall. It is sometimes suggested that the egg sags gradually during its development until it rests on the bottom of the cell The biology of the honey bee,
, Cambridge, (1987)
[1]. However, some eggs do not change position before hatching Research on the honey bee egg,
Gleanings in Bee Culture
, Volume 88, Issue 2, Number 2, p.104-111, (1960)
[2]. In absence of workers position of the egg is independent of its age and its sagging is caused by workers pushing the egg with head during incubation The cause of inclining of honeybee eggs in comb cells,
XXXI International Apicultural Congress
, Warsaw, p.181, (1987)
[3]. (scale bar = 1 mm)