Well.. your half right the yellow bird (same bird in all four pictures) is a Meadowlark but the others are Purple Martins, also avid bug catchers, I also have pictures of the adult Purple Martins but they would only land where the sun was behind them so you can't really see the color too well. And Mary the Purple Martins are almost up in your neck of the woods at Duck lake a little southeast of you guys.
Here's a bit of a profile view

[This message has been edited by Mark Wagner (edited 07-20-2002).]