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Using this metric reginal editors were able to report on the species along with their status ranks in order to identify the patterns of population growth that each species is facing. Later on, the Government of British Columbia has revised the status ranks such that Blue-Listed species are listed based on the following modifier codes [4]:
After it went out of existence, the Nature Society kept up with conservation work. [21] Lawrence Zeleny's 1976 book, The Bluebird: How You Can Help Its Fight For Survival, and a National Geographic article he wrote helped make the plight of these birds well known. [21] In 1978, the North American Bluebird Society was founded. [21]
According to the International Union for Conservation of Nature (IUCN), 77 bird species in the United States are threatened with extinction. [1] The IUCN has classified each of these species into one of three conservation statuses: vulnerable VU, endangered EN, and critically endangered CR (v. 2013.2, the data is current as of March 5, 2014 [1]).
The key for a bluebird nest box is to have the hole be exactly 1.5 inches in diameter. Too large of a hole invites starlings and makes it easier for squirrels and other larger rodents to get in.
Non-IUCN Red Listed species may also be categorized, when 'officially' on other international conservation organization &/or government agency lists. As such lists are often updated slowly, newly-discovered species and threats reliably reported in the academic literature may also be acceptable (these should be discussed and cited in the article).
As of December 2020, the International Union for Conservation of Nature (IUCN) lists 1001 near threatened avian species. [1] Of all evaluated avian species, 9.1% are listed as near threatened. No subpopulations of birds have been evaluated by the IUCN. This is a complete list of near threatened avian species evaluated by the IUCN.
The IUCN Red List of Ecosystems (RLE) is a global framework for monitoring and documenting the status of ecosystems. It was developed by the International Union for Conservation of Nature for biodiversity risk assessment. Its main objectives are to support conservation, resource use, and management decisions by evaluating all the world's ...
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