"As even casual observers now know, however, all is not perfect in the world of bees. Colony collapse disorder, or CCD, is their most recent scourge. Over the past four years, approximately 30% of U.S. honeybees alive in the fall failed to survive to pollinate blossoms in the spring. While widespread die-offs due to disease are as old as beekeeping, dating back to the 17th century at least, this one appears worse than most."

"Bateson and Wright tested their bees with a type of experiment designed to show whether animals are, like humans, capable of experiencing cognitive states in which ambiguous information is interpreted in negative fashion. "

"According to the Department of Agriculture, 33.8 percent of American honeybee colonies were destroyed between October 2009 and April 2010, a 5 percent increase from the previous year."

"What makes a worker bee a good worker? The answer may be both nature and nurture, says York University professor Amro Zayed, who is studying the genetic basis of honey bee behaviour in order to create better bee colonies."

"Infection by Nosema ceranae, a parasite that causes Nosema disease (1), results in higher mortality among honeybees when they are exposed to low doses of insecticides."

"More than 400 proteins were visualised on the gels, of which 90 were differentially expressed between the two castes. These spots were cut out of the gels and identified by mass spectrometry, searching against the Apis mellifera (honeybee) database of the NCBI. A total of 61 proteins were identified this way, 41 being up-regulated in the drone and 20 in the workers."

Insect compound eye consists of many closely packed ommatidia.
Structure and development of the compound eye of the honey bee,
Proceedings of the Academy of Natural Sciences of Philadelphia
, Volume 57, p.123–157, (1905)
[1]Behavioral analysis of light intensity discrimination and spectral sensitivity in the honey bee, Apis mellifera,
Journal of Comparative Physiology
, Volume 95, Number 3, p.203–216, (1974)
[2]The evolutionary diversity of insect retinal mosaics: common design principles and emerging molecular logic,
Trends in Genetics
, (2015)
[3]

Ocellus of honey bee. After Snodgrass (1956, fig. 98g) Anatomy of the honey bee,
, Ithaca, p.334, (1956)
[4].

Abbreviations:
a - interstitial cells
Ct - cuticle
Epd - epidermis
Ir - iris cells
Ln - lens
Nv - nerve
Pg - pigment
Ret - retina
VB - vitreus body

The ocelli can be used by bees to detect light intensity during dawn and dusk Die Orientierung der Honigbiene in der Dämmerung, zugleich ein Beitrag zur Frage der Ocellenfunktion bei Bienen,
Z. vergl. Physiol.
, Volume 49, p.420-458, (1965)
[5].
See also Regional differences in the preferred e-vector orientation of honeybee ocellar photoreceptors,
Journal of Experimental Biology
, (2017)
[6]

Ommatidium of honey bee. After Snodgrass (1956, fig. 99c) Anatomy of the honey bee,
, Ithaca, p.334, (1956)
[4], Goodmann (2003, fig. 2a) Form and function in the honey bee,
, Cardiff, p.220, (2003)
[7].

Abbreviations:
Axn - axon
bMb - basement membrane
CgCl - corneagenous cell
Cn - crystalline cone
Ln - lens
PgCl - pigment cell
RetCl - retinal cell
9RetCl - ninth retinal cell
Rhb - rhabdom

Ommatidia located in the dorsal part of honey bee eye differ from others Structural specialization in the dorsal retina of the bee, Apis mellifera,
Cell and tissue research
, Volume 162, Number 1, p.23–34, (1975)
[8].

Nervous system of honey bee. After Michener (1974, fig. 1.11) The social behavior of the bees: a comparative study,
, Cambridge, Mass., (1974)
[9].

Abbreviations:
Br - brain
O - ocellus
SoeGng - suboesophageal ganglion
1Gng-7Gng - ganglia