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Since 1967 WWF-Canada has been working with business, government and the public to stop the degradation of the planet's natural environment, and to build a future in which humans live in harmony with nature.

The wren is a family (Troglodytidae) of small, mainly brown, insectivorous songbirds, characterized by chunky bodies, tails that are often erect, and forceful rather than musical songs.

Yellowish disc florets (3-10) make up the central part, which is surrounded by 5 petal-shaped ray florets. They bloom from May to October. Yarrow has a dry, one-seeded fruit. Throughout the ages, yarrow has been used to stop blood flow, hence one common name, "nosebleed.

at genus level is based on the morphology of the spores and vegetative cells and, at species level, by the ability to metabolize different sugars and related compounds.

Yellowjacket is the common name for wasps in the genera Vespula and Dolichovespula. They belong to the insect family Vespidae in the order Hymenoptera, which also includes other types of wasps such as hornets, as well as bees and ants. Worldwide, there are about 50 recognized species of yellowjacket, 17 of which are native to Canada. These native species include the common (Vespula alascensis), Eastern (V. maculifrons), Western (V. pensylvanica) and aerial (Dolichovespula arenaria) yellowjacket. One species, the German yellowjacket (V. germanica), is introduced to Canada and is especially common in Ontario and Quebec.

Yew is the common name for evergreen conifers, genus Taxus, of the yew family (Taxaceae).

At 3,185 km (1,149 km of which lie in Canada), the Yukon River is among the longest rivers in the country (see also Longest Rivers in Canada). Its headwaters are in the northwest corner of British Columbia, at the province’s border with the Yukon. It flows north and northwest across the Yukon into Alaska, then west to Norton Sound on the Bering Sea. Within the large central plateau of the Yukon, ringed by the Mackenzie Mountains to the east and the St. Elias range to the southwest, the Yukon River and its tributaries form the region’s dominant drainage basin.

Zinc (Zn) is a bluish-white metal of low to intermediate hardness that melts at 419°C and is estimated to comprise about 0.013% of the earth's crust. Zinc is an essential element for human health; over 200 enzymes in the body require zinc for proper functioning.

Zoology is the study of ANIMALS. Zoologists have many interests: some study form (morphology) or function (physiology), from gross to molecular levels; behaviour (ethology); association (ecology); or distribution (zoogeography); and some specialize in one kind of animal.

Zooplankton, weakly swimming animals belonging to many phyla (primary divisions of the animal kingdom), which, as larvae or adults, exist wholly suspended within a water body.

Zoos, also known as zoological gardens, are facilities exhibiting wild and domesticated animals for purposes of education, recreation, conservation and research. Zoos range from conventional, dense-occupancy facilities to open animal parks and game farms. They can incorporate aquariums exhibiting fish and other aquatic life forms. There are 28 accredited zoos in Canada, according to the Canadian Association of Zoological Parks and Aquariums. Canada’s largest zoo is the Toronto Zoo.