A species becomes extinct when its death rate is continually greater than its birthrate.

Credits

Image: Extinction by Dallas Krentzel

Information sourced from:

The IUCN Red List of Threatened Species (2015), How Many Species are Threatened? [online], Available from: http://www.iucnredlist.org/about/summary-statistics#How_many_threatened [accessed 07/06/2015].

Giller, Geoffrey (2013), Scientific American Are We any closer to knowing how Many Species There are on Earth [online], Available from: http://www.scientificamerican.com/article/are-we-any-closer-to-knowing-how-many-species-there-are-on-earth/ [accessed 07/06/2015].

World Wildlife Fund, (2015), Overview [online], Available from: https://www.worldwildlife.org/threats/deforestation [accessed 07/06/2015].

Mother Nature Network, (2015), 10 animals presumed extinct in the last decade [online], Availabe from: http://www.mnn.com/earth-matters/animals/photos/10-animals-presumed-extinct-in-the-last-decade/gone-the-way-of-the-dodo [accessed 07/06/2015].

IUCN Red List of Threatened Species, (2015), Support the IUCN Red List [online], Available from: http://www.iucnredlist.org/current-news [accessed 07/06/2015].

Holmes, Bob (2013), New Scientist, How many uncontacted tribes are left in the world? [online], Available from: http://www.newscientist.com/article/dn24090-how-many-uncontacted-tribes-are-left-in-the-world.html#.VYe5fPlViko [accessed 07/06/2015].

150 million tribal people live in more than 60 countries across the world Survival, The world’s threatened peoples [online], Available from: http://www.survivalinternational.org/tribes [accessed 07/06/2015].

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