2009 itibariyleitibarıyla, Ookayama'daki Tokyo Teknoloji Enstitüsü'nün ana kampüsünde yaşayan [[Yeşil papağan|gül halkalı muhabbet]] kuşlarının büyük bir nüfusu var.<ref>Gardener, Alice [http://www.japantimes.co.jp/news/2009/03/19/reference/feral-parakeets/ Feral parakeets March 19, 2009] ''[[Japan Times]]'' Retrieved March 2, 2017</ref><ref>Brooks, Raglan [http://www.audubon.org/magazine/november-december-2014/tokyos-got-parrot-problem Tokyo's Got a Parrot Problem November-December 2014] ''Auburn'' Retrieved March 2, 2017</ref><ref>Kail, Ellyn [http://www.featureshoot.com/2014/08/eerie-photos-feral-parrots-tokyo/ EERIE PHOTOS OF FERAL PARROTS IN TOKYO August 22, 2014] ''Featureshoot'' Retrieved March 2, 2017</ref>
