Research

Canuck
https://www.washingtonpost.com/news/animalia/wp/2016/05/27/the-oddly-sweet-story-of-a-crow-that-stole-a-knife-from-a-crime-scene/?utm_term=.5074683f85b6

Crow attack
https://www.standard.co.uk/news/warning-over-crow-attacks-7257254.html

Photo gallery(research)
http://www.pbs.org/wnet/nature/a-murder-of-crows-photo-gallery/5942/

Variations of crows
https://www.rspb.org.uk/birds-and-wildlife/wildlife-guides/bird-a-z/crow-family

General facts
https://www.livescience.com/52716-crows-ravens.html

Myth and legend
https://mysticurious.com/what-do-crows-ravens-symbolize
http://www.thewonderofbirds.com/crow/mythology.htm
http://www.collective-evolution.com/2016/04/24/have-you-been-seeing-crows-what-the-crow-symbolizes-more-than-just-death/
http://www.ravenfamily.org/nascakiyetl/obs/rav1.html
https://en.wikisource.org/wiki/Popular_Science_Monthly/Volume_18/November_1880/A_Flock_of_Mythological_Crows

Anting
http://www.besgroup.org/2012/08/13/crows-anting-in-an-anthill/

Funeral
http://www.sciencedirect.com/science/article/pii/S0003347215003188
https://www.livescience.com/53283-why-crows-hold-funerals.html

Bad reputation
https://www.theatlantic.com/science/archive/2017/10/the-case-for-crows/544424/
https://www.nytimes.com/2014/12/23/science/crows-bad-reputation-is-put-to-the-test.html
https://www.sciencedaily.com/releases/2015/01/150123081801.htm
https://owlcation.com/stem/american-crow-the-bird-most-people-hate

Intelligence
http://www.nytimes.com/2008/08/26/science/26crow.html

Sounds and images
https://www.hbw.com/ibc/species/carrion-crow-corvus-corone
http://www.audubon.org/news/how-tell-raven-crow

Illustration
http://www.simonprades.com/index.php/project/heads/5c21f23ec394dcd96c5af2f3a3245661.gif