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Sources:
http://www.slate.com/blogs/wild_things/2016/01/12/dogs_cats_and_other_animals_flehmen_response_to_smell.html
https://onlinelibrary.wiley.com/doi/pdf/10.1002/ar.1097
https://www.sciencedirect.com/science/article/pii/S187972961100010X
https://www.sciencedirect.com/science/article/pii/003193848990111X?via%3Dihub
https://www.sciencedirect.com/science/article/pii/0018506X87900298
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Images:
https://www.flickr.com/photos/internetarchivebookimages/14578642119/
https://www.istockphoto.com/photo/nvexed-cat-mad-kitten-face-gm803363254-130263707
https://www.istockphoto.com/photo/black-and-white-cat-picks-up-a-scent-gm956297596-261101207
https://commons.wikimedia.org/wiki/File:Sumatratiger-004.jpg
https://www.istockphoto.com/photo/giraffe-enunciates-on-bokeh-backdrop-gm654902482-119108083
https://www.istockphoto.com/photo/flehming-dutch-warmblood-gm639766084-115499247
https://www.istockphoto.com/photo/impala-gm623116198-109192951
https://www.istockphoto.com/photo/male-lion-doing-a-flehmen-grimace-gm669671424-122388693