User blog comment:Jimeee/Hearthfire confirmed as the latest add-on. Official trailer./@comment-96.242.21.156-20120907213924/@comment-3492791-20120909083920

I don't have Hearthfire, but i've seen plenty of nest that have been heavly implied to belong to the Hawks circling nearby. Some of these nests may have been replaced with Hawk eggs with the addition of Hearthfire.

Off the top of my head the only such nest I can think of is located on the walls of Castle Dour in Solitude. Try looking there.