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The tissues and body fluids of animals are subject to the same types of abnormal structural and functional changes as are those of humans. Causes and circumstances may differ but the disease processes are very similar.

Anything involving animals that creates public interest and publicity, no matter how briefly it maintains that interest, may be considered an animal issue.

Winter is the season that begins December 21 (winter solstice) and ends on March 21 (spring Equinox). In Canada cold and snow is associated with this season.

Annelids are mostly vermiform (worm-shaped), with an anterior (frontal) mouth preceded only by the prostomium, bearing sensory organs; the anus is posterior. Most have bristles (chaetae or setae), usually arranged in 4 groups on each segment.

Ant, common name for small, mostly ground-dwelling social insects of family Formicidae, order Hymenoptera.

Antimony (Sb) is a silvery-white, lustrous, crystalline solid. Uncharacteristically for metals, it is brittle and conducts heat and electricity poorly. Antimony melts at 630°C and boils at 1380°C. The mineral stibnite is the most important source of antimony.

Aphid, or plant louse, small, soft-bodied insect that sucks plant sap. Aphids belong to order Hemiptera, suborder Homoptera.

Apricot is the common name for certain members of genus Prunus of the rose family, which produce sweet, round or oblong, nearly smooth fruit (resembling a small peach), with a large, flat stone.

Arachnida is a large class of chelicerate arthropods (segmented, jointed-limbed animals) including the orders Araneae, Scorpiones, Opiliones, Pseudoscorpiones, Solifugae and the subclass Acari.

Representative specimens are usually labelled with their common and scientific names, family name and the country of origin may appear as well. The parents of hybrids may also be indicated.

Arctic animals are those that have adapted physically and behaviourally to the particular conditions of life in the most northerly regions on the planet.

Humans have been exploring the North American Arctic for centuries, beginning about 5,000 years ago when Palaeoeskimos were looking for a homeland.

Once one of the purest and cleanest places on Earth, the Arctic has been tarnished, dimmed by a dirty blanket of reddish-brown smog. Coined in the 1950s, the arctic haze which arrives each fall and winter is a totally unexpected phenomenon recorded nowhere else on Earth.

The Subarctic covers a relatively large area in eastern Canada; its western counterpart, formed where Pacific and Arctic waters meet and mix, is restricted to a narrow band along the shore of the Beaufort Sea (see Coastal Waters).

Arthropoda, phylum of bilaterally symmetrical animals having external skeletons (exoskeletons), multisegmented bodies and paired, jointed appendages.

Artiodactyla is an order of even-toed mammals that walk on their toenails (unguis). This and the other order of hoofed mammals, the Perissodactyla, are collectively called ungulates.

The name asbestos comes from a Greek word meaning "inextinguishable" (often mistaken to mean "incombustible"). Asbestos is a collective term that is used to designate 2 separate groups of silicates: the serpentine group and the amphibole group.

Ash (Fraxinus), genus of trees or shrubs of olive family (Oleaceae). About 60 species occur worldwide, primarily in cold temperate regions; 4 are native to Canada.

Asparagus (Asparagus officinalis) is a perennial vegetable of the Lily family. Of Eurasian origin, asparagus was grown for food and medicinal purposes over 2000 years ago.

Aspen, deciduous, hardwood tree in genus Populus of Willow family. Trembling (quaking) aspen (P. tremuloides) and largetooth aspen (P. grandidentata) are native to Canada.