"Conservation status [of a migratory species]" means the sum of the influences acting on the [migratory] species that may affect its long-term distribution and abundance; c) "Conservation status" will be taken as "favourable" when: (1) population dynamics data indicate that the [migratory] species is maintaining itself on a long-term basis as a viable component of its ecosystems; (2) the range of the [migratory] species is neither currently being reduced, nor is likely to be reduced, on a long-term basis; (3) there is, and will be in the foreseeable future sufficient habitat to maintain the population of the [migratory] species on a long-term basis; and (4) the distribution and abundance of the [migratory] species approach historic coverage and levels to the extent that potentially suitable ecosystems exist and to the extent consistent with wise wildlife management; d) "Conservation status" will be taken as "unfavourable" if any of the conditions set out in sub-paragraph (c) of this paragraph is not met (Source: CMS, Art 1b-d)