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August (published; study received in 2011). Thailand: Dr. Michael Gumert, of Nanyang Technological University in Singapore, led a study that found that when human developments disrupt the habitats of tool-using animals, it can make it hard for the animals to keep that tradition. Some monkeys (macaques) in Thailand use stones to break open shells, but humans are making it too hard for the macaques to get to the beaches. The macaques aren't dying out, but they're using tools much less.
Sources
Michael D. Gumerta, Yuzuru Hamadaa, and Suchinda Malaivijitnond. "Human activity negatively affects stone tool-using Burmese long-tailed macaques Macaca fascicularis aurea in Laem Son National Park, Thailand." Oryx (2013) DOI: 10.1017/S0030605312000130 http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8963202
Matt McGrath, "Illegal palm oil developments force monkeys to down tools." 2013-08-16. BBC (online news). http://www.bbc.co.uk/news/science-environment-23711013
Alasdair Wilkins, "We are now accidentally making monkeys dumber." 2013-08-18. io9 (online magazine). http://io9.com/we-are-now-accidentally-making-monkeys-dumber-1164020843
August (published; study received in 2011). Thailand: Dr. Michael Gumert, of Nanyang Technological University in Singapore, led a study that found that when human developments disrupt the habitats of tool-using animals, it can make it hard for the animals to keep that tradition. Some monkeys (macaques) in Thailand use stones to break open shells, but humans are making it too hard for the macaques to get to the beaches. The macaques aren't dying out, but they're using tools much less.
Michael D. Gumerta, Yuzuru Hamadaa, and Suchinda Malaivijitnond. "Human activity negatively affects stone tool-using Burmese long-tailed macaques Macaca fascicularis aurea in Laem Son National Park, Thailand." Oryx (2013) DOI: 10.1017/S0030605312000130 http://journals.cambridge.org/action/displayAbstract?fromPage=online&aid=8963202
Matt McGrath, "Illegal palm oil developments force monkeys to down tools." 2013-08-16. BBC (online news). http://www.bbc.co.uk/news/science-environment-23711013
Alasdair Wilkins, "We are now accidentally making monkeys dumber." 2013-08-18. io9 (online magazine). http://io9.com/we-are-now-accidentally-making-monkeys-dumber-1164020843
