Delta Birds: Radke Park

The Osprey (Pandion haliaetus), also known as the "fish hawk" or "sea hawk," is a large diurnal raptor found on every continent except Antarctica. It is uniquely specialized for a diet consisting almost exclusively of fish. 

Key Characteristics

• Appearance: Ospreys have dark brown upperparts and a predominantly white underside. A distinctive dark brown stripe runs through the eye area on an otherwise white head.
• Size: They reach 21–25 inches in length with a wingspan of 4.5–6 feet. Females are typically slightly larger than males and may have a more prominent "necklace" of brown feathers on their breast.

Flight Profile: In flight, their long, narrow wings are held with a characteristic "crook" at the wrist, creating a distinctive "M" shape when viewed from below. 

Specialized Hunting AdaptationsOspreys are the only raptors that dive completely underwater to capture prey. Their unique physical traits include: 

• Reversible Outer Toes: They can rotate their outer toe backward to grip slippery fish with two toes facing forward and two backward.
• Spicules: The soles of their feet are covered in sharp, velcro-like spines that help them hold onto wet prey.
• Closable Nostrils: Their nostrils can close completely during high-speed dives into the water.
• Aerodynamic Carry: After a catch, they always reposition the fish to face head-first to reduce wind resistance during flight. 

Habitat and Nesting

• Location: They live near any large body of shallow water, including lakes, rivers, and coastal estuaries.
• Nests: They build large, bulky stick nests on high structures like dead trees, rocky ledges, or man-made nesting platforms. These nests are often reused and expanded for many years, sometimes reaching massive sizes.
• Reproduction: They typically lay 2–4 eggs. If food is scarce, the oldest and strongest chick often survives at the expense of its younger siblings. 

Conservation Status:  Osprey populations suffered a major decline in the mid-20th century due to DDT pesticide use, which caused eggshell thinning. Since the 1972 DDT ban in the U.S., they have become a major conservation success story, with populations rebounding across much of their range.