Here's an image of a Great Blue Heron track I saw today.  I also saw a cast of kestrels.  Say that 5 times fast!  I saw 5 kestrels within twenty or so yards of one another which I have never seen before.  Pretty amazing falcon and small too.  I also saw a parliament of owls in a spot where I usually do, a lone bat in the middle of the day, a tidings of magpies, a kettle of nighthawks and of course an unkindness of ravens.  While I did see a single great blue heron here and there, I never saw a siege (a group of herons is a siege).

The GBH track: