I wish a few folks I've met over the years who were certain animals don't feel but are just "...pure instinct" could see this one (or any of your shots). I've got no doubts the cutie on the right is doing some combo of laughing (maybe he just told a dumb joke or one of the siblings did), bragging how he wrestles better than them both, or something like "Guys - you won't believe size of the salmon i saw jumping just now! - hurry up, finish rough-housing, supper's on!"