Juvenile ospreys resemble adults, but have a somewhat speckled appearance due to buff-colored tips on their dark brown upper-wing and back coverts and a less well-defined necklace. Juveniles also have an orange-red iris, rather than the yellow iris that is typical of adults. Juvenile plumage is replaced by adult plumage by 18 months of age.
Ospreys are sexually mature at approximately 3 years old, but may not breed until age 5 in areas where nest sites are scarce.
Canon 450D, EF70-300mm f/4-5.6 IS USM