The institute for bird populations studies the abundance vital rates and ecology of bird populations to enable conservation of birds and their habitats. 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. We investigate past and present conditions influencing variation in the survival reproduction and behavior of birds we analyze long term data from focal studies and citizen science data to understand changes in bird populations in response to weather predation competition and disease as well . David f desante institute for bird populations 415 663 2052 direct email click here robert johns american bird conservancy 202 888 7472 email click here washington dc june 16 2015 a new website unveiled by the institute for bird populations ibp provides unprecedented estimates of the vital rates of over 150 species of north . With that in mind the authors of the 2014 state of the birds report analyzed north american bird populations for evidence of sharp recent declines among species that have always been numerous
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