The top shot of the bird was shot at 200mm with the 55-300, and the bottom one was at 38 mm with the 24-70. If you download the pictures into iPhoto you should be able to see the EXIF data. Also I downloaded a program called EXIF viewer for my iMac which gives you more extensive information. I'm still struggling with the Mac and use Opanda on my PCs which gives very detailed info.
I can't really take pictures of these birds at much lower ISOs because of a lack of light, but would be happy to give you some samples of other subjects. I'll try to post a few later.