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Five most recent topics
- Consultation on a subset of potential taxonomic changes to passerines
- Global IUCN Red List for birds – 2015 changes
- The taxonomic treatment of the Little Shearwater (Puffinus assimilis)/Audubon’s Shearwater (P. lherminieri) complex is being revised, and P. bryani is being recognised as a species: request for information
- Black-bellied Sandgrouse (Pterocles orientalis) – request for information from Central Asia
- Tessmann’s Flycatcher (Muscicapa tessmanni): List as Least Concern?
- 10 stunning portraits of Argentinian birds [PHOTOS] July 28, 2016Today we don't only celebrate 100 years of our Partner Aves Argentinas but also the incredible biodiversity they conserve. This is only the first round! For more stories like this, subscribe to our email list:
- The early days of Aves Argentinas July 28, 2016Today Aves Argentinas turns 100 years old. Where does the organization come from? What was the vision of its founders? And, given the colourful variety of birds living in the country, how did the dull-looking Rufous Hornero become the national emblem of the country? We take a look back in time.
- 100 years of Aves Argentinas July 28, 2016In 1916 the Sociedad Ornitológica del Plata was founded by a small group of visionaries. Today it counts 3,000 members and works on over 1,000 species. Hernan Casañas, CEO of the organization, reflects on a century of conservation work.
- 10 stunning portraits of Argentinian birds [PHOTOS] July 28, 2016
Tag Archives: Grey Crowned-crane
When this species was uplisted from Least Concern to Vulnerable in the 2009 Red List update, there was some evidence to suggest that declines may have exceeded a rate of 50% during the past three generations or 45 years (Beilfuss et al. 2007), but data were regarded as patchy and an overall decline of 30-49% was considered a more reasonable estimate. Overall estimates suggest that the species’s global population has declined from over 100,000 individuals in 1985 to 50,000-64,000 individuals in 2004 (Beilfuss et al. 2007). This implies that the species may have declined by over 50% in 19 years, and when these data are extrapolated to a period of 45 years in the past (1967-2012) or past and future (1985-2030), assuming an exponential trend, the calculated rate of decline is c.65-80%.