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Articles on IUCN

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Dodos have been extinct for centuries, but it’s not a simple matter to definitively designate a species as extinct. (Shutterstock)

When is a species really extinct?

Species are declared extinct when there have been no verifiable sightings for 50 years. Declaring a species extinct has implications for conservation efforts and policies.
Sharks and rays have ruled the ocean for 420 million years, but that reign may be slipping. (Mark Erdmann)

Sharks and rays are in free fall: More than one-third are threatened with extinction from overfishing

Nearly all species of sharks and rays are captured in fishing operations. But research shows that fishing quotas and closing some areas to fishing can help rebuild threatened populations.
Environmental DNA is a promising tool for tracking species in freshwater ecosystems like Oregon’s Elkhorn Creek. Greg Shine, BLM/Flickr

Scientists at work: We use environmental DNA to monitor how human activities affect life in rivers and streams

Rivers are among the most embattled ecosystems on Earth. Researchers are testing a new, inexpensive way to study river health by using eDNA to count the species that rivers harbor.
A specimen of Proscelotes aenea collected by Loveridge in 1918 in Lumbo, Mozambique, now kept at the Museum of Comparative Zoology, Harvard University. Licensed under http://creativecommons.org/licenses/by-nc-sa/3.0/

Search for elusive skinks is filling gaps in Mozambique’s biodiversity data

Species distribution data – or a lack thereof – can have a major bearing on how a country’s Key Biodiversity Areas and protected areas are designated.
In some African countries, lion trophy hunting is legal. Riaan van den Berg

Recreational hunting, conservation and livelihoods: no clear evidence trail

Debates centred on the role of recreational hunting in supporting nature conservation and local people’s livelihoods are among the most polarising in conservation today.

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