I enjoyed making some small cemetary etchings a few years ago. Here's one of six that I made. I'm not sure you can see it here but there are a few birds in this etching. I didn't have quite enough courage to do my research on tombstones at night but I did visit one of the larger cemetaries during daylight hours in search of some interesting tombstones! Although here I did use a little imagination.
Also, there's an exhibit in the main hallway of the Selden Arcade where my studio is located that is showing photographs of cemetaries. Here is the exhibition poster and a few interesting photos. I just noticed it today so I'll have to go back and take another look!