What's the difference between range and habitat?

Range is a geographic area on a map — for example, 'across the Eurasian temperate zone.' Habitat is the type of environment a species uses within that range — for example, 'open farmland and forest edge.' A species can have a huge range but occupy only a narrow slice of habitat within it, appearing only where that specific habitat exists.

Does a species' range stay fixed over time?

No. Ranges shift with climate, land use, and species-specific factors — many European birds have expanded their range northward over recent decades as winters warm, while habitat loss has contracted the range of species tied to specialized environments like old-growth forest or undisturbed wetland.

Bird Atlas

Range (Habitat Range)

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A species' range is the total geographic area where it occurs, distinct from habitat, which describes the type of environment it uses within that area.

Range vs. habitat

A species' range is the total geographic area across which it is found — described in broad terms like "across Eurasia" or in more specific terms like "European Russia and Western Siberia." Habitat is a related but distinct concept: the type of environment the species actually occupies within that range, such as open farmland, mature deciduous forest, or reed-fringed wetland. A bird's range tells you where on the map to look; its habitat tells you what kind of place within that area to look in.

The Eurasian jay, for instance, has a huge range spanning most of temperate Eurasia, but within that range it is a habitat specialist, occurring almost exclusively in woodland with a strong association with oak trees, whose acorns it caches by the thousand each autumn. A birder in the middle of its geographic range will still find no jays in open steppe or farmland lacking suitable tree cover, because the habitat, not the range boundary, is what limits where the bird actually turns up locally.

Why range matters on atlas pages

Range and habitat together explain both large-scale distribution (the regional atlas pages covering different continents and countries) and local occurrence (why a species is common in one patch of forest and absent from an apparently similar one a few kilometers away). Range boundaries are rarely sharp lines — most species show a gradual thinning of density toward the edge of their range, with core areas of high abundance and marginal areas where the species is scarce or only sporadically present, often at the edge of suitable habitat or climate tolerance.

Range is also dynamic rather than fixed: many species have measurably expanded or contracted their range over recent decades in response to climate change, land-use change, or, in a smaller number of cases, deliberate reintroduction programs, so an atlas description of range reflects current knowledge rather than a permanent boundary.