Lewis’s Woodpecker

I spent two mornings the Bear Trap Trailhead Road off the  Bridger Creek Road on July 13 and July 15.  A pair of lewis’s is using the same cavity as I reported last year.  I observed the following:

1.  There are three adults actively feeding.  Maybe one is an offspring from last year helping out?
2.  Same with last year, I have only seen them feed the same color/type of butterfly.  (I have not be yet able to positively ID said species of butterfly)
3.  Along with moths, berries, ants, etc. I observed them on three different occasions within the hour feeding their young, birds that look embryonic.  I searched some field guides and none mention that they predate nests or eat other birds.