Wednesday, January 29, 2020
IMMATURE MAGNIFICENT FRIGATEBIRD GRADUALLY MOLTING INTO ADULT MALE, FRANK G. MACKLE COMMUNITY PARK,MARCO ISLAND,FLORIDA, 1/29/2020
Immature Magnificent Frigatebirds remain in their juvenile plumage for 4 to 6 years and then molt into their respective adult plumage type. The immature Frigatebird is similar to the adult female, but the white on the undersides extends to the belly.
In the photos below we can see that the white of the underside does extend to the belly and that it is gradually getting black throughout. This indicates that it is an immature male that is gradually molting into its adult plumage.