B - Uncultivated lands between protected areas without documentation on animal movement.
These are usually patches of natural vegetation that lie between two protected areas, or sometimes a string of forest reserves or wildlife management areas (WMAs) between larger protected areas.
For almost all such corridors, it is not known whether any population actually uses them to move between the protected areas. Furthermore, habitat suitability and the population sizes of species living in these corridors are unknown.
Such corridors may be needed in the future if habitat in one of the protected areas becomes modified and unsuitable, for example through climate change, oil exploration or mining.
These areas may also be very important for wildlife already, e.g. forest dwelling birds that will not cross open spaces, but this is not documented as yet.