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| Mammals by population |
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This is a collection of lists of organisms by their population. While most of the numbers are estimates, they have been made by the experts in their fields. Species population is a science falling under the purview of population ecology and biogeography. Individuals are counted by census, as carried out for the piping plover;[3][4] using the transect method, as done for the mountain plover;[5] and beginning in 2012 by satellite, with the emperor penguin being first subject counted in this manner.[6]
- ^ BirdLife International (2012). "Sturnus vulgaris". IUCN Red List of Threatened Species. Version 2012.2. IUCN. Retrieved 2012-12-22.
- ^ "U.S. POPClock Projection". U.S. Census Bureau.
- ^ Forest and Rangeland Ecosystem Science Center. "2011 International Piping Plover Census: Study Description". United States Geological Survey. Retrieved 2012-12-24.
- ^ "Positive Piping Plover Count". Government of Saskatchewan. 6 Nov 2006. Archived from the original on 2013-05-06. Retrieved 2012-12-24.
- ^ "Mountain plover survey guidelines — Wyoming" (PDF). United States Fish and Wildlife Service. March 2002. Archived from the original (PDF) on 2013-06-02. Retrieved 2012-12-24.
- ^ Dell'Amore, Christine (13 April 2012). "Emperor Penguins Counted From Space—A First". National Geographic News. National Geographic. Archived from the original on April 15, 2012. Retrieved 2012-12-22.