Hey, Rita! I about mowed over a nest of eggs on Sunday while driving the tractor. The mother came and stood between me and the tractor to get me to veer off away from her young'uns.
Year before last we had a nest of killdee on our septic field. This year it is smack dab in the middle of our huge front yard. I had my future husband put up a red flag marker so we would be able to see her the next time we mow.
I really don't know anything about these birds except that the mother and father are very protective of the nest. They will walk away from the nest acting injured to distract you if you get too close to their babies. Beautiful birds and very brave, too.
Here is a link I found while searching for some information for you:
http://www.birdwatching.com/stories/killdeer.html Dianna