Matthew (my oldest-9) helps out all the time. He pretty much cares for them while I'm at work.
Joshua (6) likes to catch grasshoppers for them but not much else.
Timothy (1) just wants to cuddle with them, although they do not share his love of being squeezed...LOL
My boys love our PBRs the most, they are all names Henryetta (because we can't tell them apart)