River Hawk Skull Replica or Osprey Bird Skull Replica measures 3.3 inches. Osprey Bird Skull Replica model is museum quality polyurethane resin cast made in the USA. 2-part skull

The River Hawk or Osprey also called sea hawk, and fish hawk, is a diurnal, fish-eating bird of prey with a cosmopolitan range.

It is a large raptor, reaching more than 24 in. in length and 71 in. across the wings. It is brown on the upperparts and predominantly greyish on the head and underparts.

The River Hawk or Osprey tolerates a wide variety of habitats, nesting in any location near a body of water providing an adequate food supply. It is found on all continents except Antarctica, although in South America it occurs only as a non-breeding migrant.

The Osprey breeds near freshwater lakes and rivers, and sometimes on coastal brackish waters. Rocky outcrops just offshore are used in Rottnest Island off the coast of Western Australia.

Ospreys usually mate for life. Rarely, polyandry has been recorded. The breeding season varies according to latitude: spring (September–October) in southern Australia, April to July in northern Australia, and winter (June–August) in southern Queensland.

In spring the pair begins a five-month period of partnership to raise their young. The female lays two to four eggs within a month and relies on the size of the nest to conserve heat.

The River Hawk or Osprey eggs are whitish with bold splotches of reddish-brown and are about 2.4 in × 1.8 in. and weigh about 2.3 oz. The eggs are incubated for about 35 to 43 days to hatching.The newly hatched chicks weigh only 1.8–2.1 oz., but fledge in 8 to 10 weeks.

When food is scarce, the first chicks to hatch are most likely to survive. The typical lifespan is 7 to 10 years, though rarely individuals can grow to as old as 20 to 25 years.

The River Hawk or Osprey is piscivorous, with fish making up 99% of its diet. It typically takes live fish weighing 5.3–10.6 oz. and about 9.8–13.8 in. in length.

River Hawk or Ospreys have a vision that is well adapted to detecting underwater objects from the air. Prey is first sighted when the osprey is 33–131 feet above the water, after which the bird hovers momentarily and then plunges feet first into the water.

They catch fish by diving into a body of water, oftentimes completely submerging their entire bodies. As an osprey dives it adjusts the angle of its flight to account for the distortion of the fish’s image caused by refraction.

River Hawk or Ospreys will typically eat on a nearby perch but have also been known to carry fish for longer distances.

The oldest European wild osprey on record lived to be over thirty years of age. In North America, great horned owls, golden eagles and bald eagles are the only major predators of Ospreys, capable of taking both nestlings and adults.

Kleptoparasitism by bald eagles, where the larger raptor steals the River Hawk or Osprey’s catch, is more common than predation. The white-tailed eagle, which is very similar to the bald eagle, may harass or prey on the osprey in Eurasia.

Raccoons can be a serious threat to nestlings or eggs if they can access the nest. Endoparasitic have been recorded in wild Ospreys.

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