Pecking order is a system of organization among a flock of poultry. In this system, a bird pecks another bird who is of lower rank, and submits to pecking from a bird of higher rank. Among mammals and other animals, the term "dominance hierarchy" is used. A dominance hierarchy is an organizational form by which individuals within a community control the distribution of resources (goods and services) within the community. ...
The bigger chick is usually first to be fed and cared for, but as long as there is enough food to support both babies, they both have a good chance of surviving.
Chickens were the first birds observed developing a linear dominance hierarchy, so we often call this arrangement a peckingorder.
How is their "peckingorder" similar to that of a whooping crane cohort?
Peckingorder is a system of organization among a flock of poultry.
Still, the term "peckingorder" is often used synonymously as well, because the "peckingorder" was the first studied example of the social hierarchy among animals.
The basic concept behind the establishment of the peckingorder among, for example, chicken, is that it is necessary to determine who is the 'top chicken,' the 'bottom chicken' and where all the rest fit in between.