What does this number measure?
A passerine often found near human dwellings. Displayed dimension: representative length.
Compare the stated dimensions
The comparison uses the number in each fact sheet: altitude, height, diameter, length or distance, depending on the reference. Two values in metres do not necessarily describe the same property.
Source and limitations
Catalogue value to check against the source; not individually audited.
Naturalistic illustration of a house sparrow; anatomy, texture and colouring are interpreted, not a photograph.