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Why Echidnas Are Evolutionary Misfits

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It’s pretty well known that Australia is home to some strange animals, but echidnas are especially weird evolutionary misfits.

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Sources:
http://www.nationalgeographic.com.au/animals/how-the-platypus-and-echidna-lost-their-stomachs.aspx
https://www.smithsonianmag.com/smart-news/many-animals-including-the-platypus-lost-their-stomachs-180948103/
http://phenomena.nationalgeographic.com/2013/12/03/how-the-platypus-and-a-quarter-of-fishes-lost-their-stomachs/
http://www.nationalgeographic.com.au/animals/echidna.aspx
http://journals.plos.org/plosone/article?id=10.1371/journal.pone.0006070#s1
http://www.publish.csiro.au/ZO/ZO09037
https://eprints.utas.edu.au/2320/1/Nicol_et_al._2007_The_life_history_of_an_egg-laying_mammal2C_the_echidna_Ecoscience.pdf
http://www.sciencedirect.com/science/article/pii/S0531556508001629
http://reptilepark.com.au/animals/mammals/echidna/
http://www.abc.net.au/science/articles/2011/01/11/3110568.htm
http://onlinelibrary.wiley.com/doi/10.1002/jcp.1040670108/abstract
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5399094/
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2441467/
http://www.ucl.ac.uk/museums-static/obl4he/vertebratediversity/monotremes.html
http://www.jstor.org/stable/10.1086/522847?seq=2#page_scan_tab_contents
http://www.environment.nsw.gov.au/resources/nature/Factsheet3Echidnas.pdf
http://ro.uow.edu.au/cgi/viewcontent.cgi?article=1591&context=hbspapers
https://www.researchgate.net/publication/290413985_Marsupial_and_Monotreme_Evolution_And_Biogeography

Image Sources:
https://commons.wikimedia.org/wiki/File:Heteropoda_venatoria_-_female_at_Mechode_Padur.jpg
https://commons.wikimedia.org/wiki/File:CSIRO_ScienceImage_10356_Superb_Lyrebird.jpg
https://commons.wikimedia.org/wiki/File:Monotreme_reproductive_organs.png

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