There are all sorts of behaviors we can observe by watching various species of birds eat at our feeders.  For example, whenever a flock of blue jays descends on a feeder, invariably only one bird will feed at a time.  This is because blue jays flocks have a dominance hierarchy.  Consequently, the most dominant bird in the flock is the first to feed.  Once it has fed, the others will feed according to their ranking in the hierarchy.  As such, the least dominant blue jay feeds last.