Young birds are brown or gray with black beaks, and take four years to reach full plumage.

The full adult plumage is attained in the fourth or fifth year.

During the second year of life, full adult plumage is attained in the tragopan.

It does not acquire the full adult plumage until 4-5 years old.

The juveniles take two years to attain full adult plumage.

The younger birds reach sexual maturity (and full adult plumage) at anywhere from two to five years of age.

It attains full plumage at three years of age.

Young males begin to acquire full adult plumage in their first year.

This gull takes 4 years to reach full adult plumage.

The numbers are dropped after a bird achieves its full adult plumage.