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The American robin (Turdus migratorius) is the largest and best-known member of the thrush family in Canada.

Amphibians are members of a group of tetrapod (4-legged) vertebrate animals derived from fishes, and are the common ancestor to mammals and reptiles.

Anemone, or wind flower, perennial, herbaceous plant of genus Anemone, family Ranunculaceae.

Animal evolution has resulted in a vast number of adaptations for successful life under all sorts of conditions, so that there are now more kinds of animals than of all other living things combined.

Animal agriculture is the practice of breeding animals for the production of animal products and for recreational purposes.

Domestication was performed through controlled mating and reproduction of captive animals which were selected and mated based on their behaviour and temperament.

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.

Antelope, see PRONGHORN.

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.