A Tiger Conservation Landscape (TCL) is a block or cluster of blocks of
habitat meeting a minimum size threshold specific to habitat-type, where
tigers have been confirmed to occur in the last 10 years and are not
known to have been extirpated. A TCL has the following attributes: (1) A
TCL has evidence of one or more tigers over the last 10 years; (2) A TCL
can consist of several adjacent blocks of habitat among which tigers can
disperse, up to a distance of 4 km; (3) A TCL need not be restricted to
nor contain protected areas, but instead includes the entire landscape
over which tigers may disperse and become established; (4) A TCL must
meet a minimum core area requirement for its largest block of habitat
that is specific to the habitat-type in which it is found; (5) TCL
boundaries are defined either where habitat ends with no suitable
habitat within 4 km for the tiger to disperse to, or at country or
ecoregion boundaries. TCLs are identified according to their Class and
Priority. Class refers to a TCL's current conservation status and
probability for achieving conservation success in the next decade (Class
I is highest, Class IV is not enough information). TCL priority
indicates priority for conservation investment, ensuring the suite of
Global and Regional Priority TCLs are representative across biomes and
bioregions. For more information, see Chapters 4 and 6 in WCS, WWF,
Smithsonian, STF 2006.