We have 3 chickens. We also have 6 people who live in our collective household, so we tend to go through a fair amount of eggs every week. Whole or cracked egg shells generally do not compost well. When we harvest our worm bin we often notice a few things like egg shells, seeds/pits, & avocado skins still in tact. We've tried to start seeds in egg shells but the plants always seem to get root bound way too quickly so I don't recommend doing it. Always looking for diy hacks, Dan & I did a little research and found some great ways to use up those egg shells and actually get some benefit from it as well.
Click here to see a few tricks for using egg shells to help improve your garden