White-bellied Sea-Eagle

This is a massive feather from Australia's second-largest bird of prey. The White-bellied Sea-Eagle is an iconic raptor with a white head, breast, and tail coverts contrastingly sharply against dark grey wings. In flight, it holds its wings in a distinct 'V' shape (dihedral).

Uniformly dark slate-gray to brownish-black on the upper surface of the vane, characteristic of an adult bird. The rachis is remarkably pale, appearing creamy-white to light tan, which is a diagnostic feature for this species.

Tightly interlocked pennaceous barbs throughout most of the vane to provide aerodynamic lift. The base shows a small amount of plumulaceous (downy) structure near the calamus. The barbs are stiff and resilient.

The rachis is exceptionally thick, rigid, and pale colored. It is slightly curved to accommodate the wing's airfoil shape. Barbs are densely packed and oriented at an acute angle to the shaft.

The surface is somewhat matte with a slight oily sheen, providing water resistance necessary for a maritime hunter. The texture is stiff and 'plasticky' due to the high keratin density required for large-raptor flight.

Located on the outer wing (primaries). The extreme asymmetry and tegmen (a waxy reinforcement on the underside of the leading edge) indicate its role as a primary thrust-generating feather.

Large size (30cm+), extreme asymmetry of the vanes, and most importantly, the stark contrast between the dark grey vane and the very pale/white central rachis.

Coastal habitats, estuaries, large inland rivers, and terrestrial wetlands. Frequently found near Jervis Bay (Vincentia) roosting in tall trees overlooking the water.

Found from India and Sri Lanka through Southeast Asia to Australia and Tasmania. It is a resident breeder across the Australian coastline.

Apex predator and scavenger. They play a vital role in controlling populations of sea snakes, fish, and waterbirds. Their presence is an indicator of a healthy aquatic ecosystem.

Wedge-tailed Eagle feathers are similarly large but have a dark rachis and are generally more brownish. Osprey feathers have distinct banding/mottling which this feather lacks.

Pairs of Sea-Eagles often perform spectacular aerial displays where they lock talons and spin through the air in a 'cartwheel' before releasing just before hitting the water or ground.

Significantly important to many Indigenous Australian coastal groups, often appearing in Dreamtime stories. It is a totem for various clans in the New South Wales South Coast region.

Look for these beneath large eucalyptus trees near the shore. Sea-Eagle nests are massive structures made of sticks used for decades; feathers are often found near the base of these 'maternity' trees.

The feather appears to be a naturally molted specimen. There is some minor wear and 'zipper' separation at the trailing edge tip, but the rachis remains structurally sound and the color is well-preserved.

Found on a beach in vincentia NSW Australia Is bigger than my forearm