Sunday, 1/9/2018, I found this American crow giving a guttural ca ca ca call . I took videos of the crow as it made the call, the video showing the crow appear to be trying to burp or gag.l..I have heard these calls before but never before got to see how the crow gives them.
https://www.youtube.com/watch?v=6KrVuPtINkk Note remnants of whitewash on crows feathers. Each morning the crows come into the NE 38th st-465 area of Indianapolis from the SE, meaning they are coming in from the huge roosts downtown. The crows line every branch leaving rows of crows above other rows.If the crows are disturbed in the darkness, they defecate, the sound of this hitting the ground sounding like rice falling on the ground. This also falls on lower tier crows leaving many with white markings as they leave the roost downtown and head to their customary feeding areas. The crows take huge communal baths before retiring to the roosts in the evening but during the day many will show white blotches on their feathers. This fall, I saw one American Crow with white on the wing coverts visible in flight, a condition Sibleys field guide says is rare but happens.