A habitat in ecology is the specific natural environment characterized by physical and biological factors that dictates the conditions for the needs of organisms, populations and species to live, grow and reproduce.
Abiotic factors: sunlight, soil, water quality, climate.
Biotic factors: other species and animals.
(National Institute of Health)

Important features: mature/old growth stands, riparian areas, cavity trees, dead standing trees, winter cover, riparian forest and fish, small streams, seepages, woodland pools, cavity trees, mast trees, scattered conifers in hardwood stands, and supercanopy trees.

Management & Protection: maintenance includes tracking tree species age, distribution
Selection for harvest or retention: tree size, vigour, quality, biodiversity concerns and wildlife habitat value. Strong focus on biodiversity and other ecosystem value.

Endangered: protect habitat for species at risk under Endangered Species Act

Unique habitat types:
Dune
Mangrove
Peat swamp
Bog, swamp, wet woodland (high water table with acidic loving vegetation)
Temperate rainforest
Ancient/Old Growth
Urban Forest (city installations)
...