Digestive system of honey bee worker. After Michener (1974, fig 1.11) The social behavior of the bees: a comparative study,
, Cambridge, Mass., (1974)
[1].

Abbreviations:
An - anus
Cb - cibarium
Cr - crop
Ephy - epipharynx
Int - intestine
Mal - Malpighian tubules
Mth - mouth
Oe - oesophagus
Phy - pharynx
Prvent - proventriculus
Rect - rectum
rp - rectal pad
Vent - ventriculus (midgut)

Circulatory system of honey bee. After Snodgrass (1956, fig. 78) Anatomy of the honey bee,
, Ithaca, p.334, (1956)
[2], Dade (fig. 20) Anatomy and dissection of the honeybee,
International Bee Research Association
, London, p.158, (1977)
[3], Krenn (1995, fig. 10d) Morphological diversity and phylogenetic analysis of wing circulatory organs in insects, part II. Holometabola,
Zoology
, Volume 98, p.147–147, (1995)
[4].
The main part of the system is heart. It pumps haemolymph from the abdomen to the head.
Ao - aorta
dDph - dorsal diaphragm
hv - head vesicle
Ht - heart
i - convulated part of aorta
Os - ostia
pd - pulsatile diaphragm
vDph - ventral diaphragm

Coiled sperm of honey bee. The sperm was first folded in half and later coiled. The left image was obtained using bright field microscopy and the right image was obtained using fluorescence microscopy with propidium iodide staining. The same sperm is shown in both images. The head of the sperm (bright red in right image) is at the bottom of the image. (scale bar = 10 micrometers)

Drone a few hours after emergence.

Drone emerging from its cell. Varroa destructor mite is visible behind its left eye.

Fore wing of honey bee worker with arrows indicating direction of hemolymph flow in veins. After Arnold (1964, fig. 39) Blood circulation in insect wings,
Memoirs of the Entomological Society of Canada
, Volume 38, p.5-60, (1964)
[5]. (scale bar = 1 mm)

Honey bee worker collecting nectar from Vaccinium corymbosum. Entrance to the flower is pointing downwards and the nectar is not washed out by rain.

Honey bee workers collecting water from a pond.

Honey bees collect water in order to cool the nest during hot days. When diluted nectar is not available water is also used to dilute honey offered to larvae. Honey bee foragers prefer salty water over distilled water The Choice of Drinking Water by the Honeybee,
Journal of Experimental Biology
, Volume 17, p.253-261, (1940)
[6]Salt preferences of honey bee water foragers,
Journal of Experimental Biology
, (2016)
[7]. The preference for different minerals is seasonal Seasonality of salt foraging in honey bees (Apis mellifera),
Ecological Entomology
, (2016)
[8].

Control of water foraging Temperaturregulierung und Wasserhaushalt im Bienenstaat,
Z. vergl. Physiol.
, Volume 36, p.391-432, (1954)
[9]The control of water collection in honey bee colonies,
Behavioral Ecology and Sociobiology
, Volume 41, Number 6, p.407–422, (1997)
[10].

Honey bee worker sitting on a moss and collecting water.

Fore wing (upper) and hind wing (lower) of honey bee worker. Terminology based on Michener (2000) The bees of the world,
, Baltimore, (2000)
[11]. (scale bar = 1 mm)

c - cubital cell
c1 - first cubital cell
c2 - second cubital cell
f - fold on posterior margin of fore wing
h - hooks (hamuli) on anterior margin of hind wing
jl - jugal lobe
m - marginal cell
m1 - first medial cell
m2 - second medial cell
r - radial cell
s1 - first submarginal cell
s2 - second submarginal cell
s3 - third submarginal cell
vl - vannal lobe