The institute for bird populations studies the abundance vital rates and ecology of bird populations to enable scientifically sound conservation of birds and their habitats we collaborate locally nationally and globally with individuals government agencies and ngos in diverse fields to assess the effects of land management actions climate change and other ecological stressors on bird . This is a list of bird species by global population divided by bird classification while numbers are estimates they have been made by the experts in their fields for more information on how these estimates were ascertained see wikipedias articles on population biology and population ecology. Population surveys below are descriptions and links to bird surveys that are coordinated or conducted by the migratory bird program in partnership with other agencies these surveys provide information on migratory bird population abundance distribution and trends which are important to harvest and population management . The result is common birds in steep decline a list of 33 common species compiled by scientists from the north american bird conservation initiative long term monitoring surveys indicate that each of these rapidly declining species has lost more than half its global population over the past four decades. In this lesson students will study bird migratory patterns and the methods that researchers use to study them students will be introduced to the concepts of the study of bird movements the pursuit of scientific explanations often begins with a question about a natural phenomenon science is a way
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