The male, female and juvenile plumages of each species usually differ, often in the extent of red on the crown and elsewhere on the head.
32.
Nestlings fledge in 28 days . Young marbled murrelets remain in the nest longer than other alcids and molt into their juvenile plumage before leaving the nest.
33.
Juvenile plumage is largely a uniform dark brown with occasional grey-brown streaking about the head and the neck, white feather bases, and light mottling on the rectrices.
34.
Young birds fledge with a soft plumage and then moult into a juvenile plumage before migrating and then assume an adult plumage after moulting in their winter quarters.
35.
These species are unified morphologically in exhibiting sexual dimorphism in their plumage, as well as in possessing cryptic juvenile plumage ( in all the species thus far studied ).
36.
After a month or so they go through a prebasic moult and a brownish juvenile plumage is assume with the upperparts somewhat like in adults but the underside is downy.
37.
Birds in their first post-juvenile plumage, which normally remain in their wintering areas, resemble the non-breeding adult, but have a duskier crown, dark carpal bar, and often very worn plumage.
38.
The first starts a few days after fledging replacing the "'juvenile plumage "'with an "'auxiliary formative plumage "'; the second a month or so later giving the "'formative plumage " '.
39.
:: Everything about it said gull, the shape of its beak, head, its eyes, its call, it was just the juvenile plumage and size which separated it from the common gulls.
40.
The fan-tailed warbler is sometimes placed in the monotypic genus " "'Euthlypis " "'due to its unique morphology, but its nest, eggs, voice, and juvenile plumage are consistent with " Basileuterus ".
