- Deer have horns, walruses have tusks – here’s why so few birds have weapons of their own https://theconversation.com/deer-have-horns-walruses-have-tusks-heres-why-so-few-birds-have-weapons-of-their-own-177792 57 comments environment
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- Boeing 737 - Wikipedia http://en.wikipedia.org/wiki/Boeing_737 90 comments
- United Airlines saves 170,000 gallons of fuel by using lighter paper on inflight magazine - Los Angeles Times http://www.latimes.com/business/la-fi-travel-briefcase-united-inflight-magazine-20180120-story.html#nt=oft07a-2gp1 13 comments
- Creative Commons — Attribution-ShareAlike 4.0 International — CC BY-SA 4.0 https://creativecommons.org/licenses/by-sa/4.0/ 8 comments
- https://academic.oup.com/icb/advance-article/doi/10.1093/icb/icab150/6310576 3 comments
- Arctic tern - Wikipedia https://en.wikipedia.org/wiki/Arctic_tern 0 comments
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