These indexes, however, involve serious problems of comparability between countries and regions, especially since even the most basic data, such as reliable population estimates, may be unavailable for some very poor countries.
Obtaining reliable population size or abundance estimates of endangered species is critical for their conservation and management.
Reliable population and density estimates are the cornerstone of effective conservation and management planning, as conservation priorities often arise in relation to population numbers.
In this paper we have set out to examine the extent to which Twitter data can be used to estimate local commuting flows, thus building on the nascent literature that seeks to extract reliable population indicators from social media data.
According to the NOAA, there are no reliable population estimates of fin whales.
Reliable population numbers are hard to find, partly because other animals have been mistaken for the red panda.
