参考资料:
[1]https://www.newscientist.com/article/mg22730341-600-birds-love-of-cigarette-butts-in-nests-has-two-sides-for-chicks/
[2]https://www.cbc.ca/radio/quirks/wildfires-birds-cigarette-butts-chimp-muscles-night-shifts-dna-1.4182500/city-birds-use-cigarette-butts-to-ward-off-ticks-1.4182517
[3]https://cosmosmagazine.com/nature/birds/is-it-ethical-to-train-crows-to-pick-up-cigarette-butts/#:~:text=The%20company%20aims%20to%20train,costs%20related%20to%20cigarette%20butts.
[4]https://www.independent.co.uk/climate-change/news/bird-cigarette-butt-chick-picture-florida-beach-photograph-rubbish-a8980676.html
[5]https://gizmodo.com/french-theme-park-employs-trained-birds-to-pick-up-ciga-1828301273
[6]https://www.bbc.com/news/uk-wales-61994992
[7]https://www.swissinfo.ch/eng/in-a-puff-of-smoke_who-picks-up-your-cigarette-butts-/43368196
[8]https://www.akc.org/expert-advice/health/dog-ate-cigarette-butt/
[9]https://www.oceancare.org/en/stories_and_news/cigarette-butts-pollution/
[10]https://www.nationalgeographic.com/environment/article/cigarettes-story-of-plastic
[11]https://www.bbc.com/news/uk-england-london-26464789
[12]https://www.nbcnews.com/id/wbna44494498