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Sources:
https://www.science.org.au/curious/everything-else/poison-vs-venom
https://www.nationalgeographic.com/science/phenomena/2013/01/09/on-the-origin-of-venom/
https://www.unco.edu/nhs/biology/about-us/mackessy-stephen/documents/2014-ToxinReviews-Colubrid-venoms.pdf
http://snakesarelong.blogspot.com/2013/09/basics-of-snake-fangs.html
http://reptile-database.reptarium.cz/species?genus=Rhabdophis&species=tigrinus
https://www.researchgate.net/publication/225633210_Chemical_investigations_of_defensive_steroid_sequestration_by_the_Asian_snake_Rhabdophis_tigrinus
http://www.pnas.org/content/104/7/2265.short
https://www.researchgate.net/publication/226345711_Nuchal_glands_A_novel_defensive_system_in_snakes
http://www.bioone.org/doi/pdf/10.5358/hsj.35.53
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4407547/
https://link.springer.com/article/10.1023/B:JOEC.0000045585.77875.09
https://www.jstor.org/stable/pdf/1442023.pdf?seq=1#page_scan_tab_contents
http://www.bioone.org/doi/abs/10.3105/1345-5834%282008%2927%5B23%3ACETTKN%5D2.0.CO%3B2?journalCode=jche
https://www.sciencedirect.com/science/article/pii/S092966461200109X
https://www.jstage.jst.go.jp/article/mez/40/3/40_KJ00002641969/_article
https://www.researchgate.net/publication/283084352_Natural_history_note_on_a_new_defensive_behavior_observation_from_Rhabdophis_subminiatus_helleri
https://link.springer.com/article/10.1023/B:JOEC.0000045585.77875.09
https://www.mcglothlin.biol.vt.edu/cb2016.pdf
Images:
https://commons.wikimedia.org/wiki/File:Rhabdophis_tigrinus_IMG_6559.retouch.JPG
http://www.thinkstockphotos.com/image/stock-photo-rhabdophis-tigrinus/683240674/popup?sq=%20Rhabdophis/f=CPIHVX/s=DynamicRank
http://www.thinkstockphotos.com/image/stock-photo-western-diamondback-rattlesnake-striking-with/146062145/popup?sq=snake%20fangs/f=CPIHVX/s=DynamicRank
http://www.thinkstockphotos.com/image/stock-photo-female-boomslang-snake-in-botswana/696227832/popup?sq=boomslang%20fangs/f=CPIHVX/s=DynamicRank
http://www.thinkstockphotos.com/image/stock-photo-tiger-keelback-rhabdophis-tigrinus/469459904/popup?sq=keelback/f=CPIHVX/s=DynamicRank
https://commons.wikimedia.org/wiki/File:Bufadienolide_skeletal.svg
http://www.thinkstockphotos.com/image/stock-photo-rhabdophis-himalayanus-rhabdophis-himalayanus/947821124/popup?sq=%20Rhabdophis/f=CPIHVX/s=DynamicRank
https://commons.wikimedia.org/wiki/File:Garter_Snake_(6869758932).jpg
Thumbnail: http://www.thinkstockphotos.com/image/stock-photo-tiger-keelback-rhabdophis-tigrinus/469459888/popup?sq=keelback/f=CPIHVX/s=DynamicRank