In place : Action with an established method of financing, concrete applications in the field already in place, which may have been subject to evaluation or follow-up. Year 3 and beyond. The corridor meets the IUCN definition of an ecological corridor, "a clearly defined geographical space that is governed and managed over the long term to maintain or restore effective ecological connectivity".

In progress : Action in the development phase, with several measures underway in the field, in search of additional funding. The action corresponds or is in the process of corresponding to the IUCN definition of ecological corridor presented above.

Emerging : Action not yet established in the field, in the preliminary development phase (defining the area of action, finding partners, seeking funding, setting up the action): year 0 to 1. The action is not yet recognized by legal or other effective means, but should be in the future.

Area at stake : Areas where connectivity is an issue for one or more animal species, as evidenced by the presence of a known natural migration route, or the movement of species described in scientific literature or a research program. This area does not yet contain any corridor action, yet the existence of migration routes indicates a connectivity issue for species.