Osprey Fish and Chicks Slideshow

Fish and Chicks

The Story of the Maurice River Osprey

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In the 1940-60's the organochlorine pesticide DDT was sprayed on coastal marshes in an effort to kill mosquitoes. The DDT had an adverse effect on the reproductive system of female osprey, causing their populations to plummet. By 1974 the population was about 65 pairs in NJ (from Paul Spitzer) of a historic population about 400-500 nests (NJ only). Rachel Carson’s 1962 best seller Silent Spring alerted people to the impending devastation of synthetic chemical compounds.

Osprey Facts
Species: Osprey (often called Fish Hawk)
Latin Name: Pandion haliaetus
Habitat: wetland – open water

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In 1973 the EPA finally banned DDT. This ban and the implementation of osprey recovery programs like that of Citizens United to Protect the Maurice River and Its Tributaries, Inc. have led to major strides in recovering osprey populations to former numbers.

Osprey Facts
Field Markings: Head white with dark brown mask over yellow eye, back and wings dark brown, underside mostly white with dark brown patches at wrist and on wing tips. Juveniles have orange eyes, speckled feather on back, and tawny vs. white feathers on cap and breast.

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To reintroduce osprey to an area of former abundance, first wildlife biologists removed eggs of healthy adult birds from regions that had been spared the toxic spraying. Then they placed them in nests of birds who had for a long duration been unsuccessful in incubating their eggs. These adults raised these adoptees as their own. The juveniles imprinted to the region in which they were raised and thus established new colonies of healthy birds.

Osprey Facts
Hatchlings: immobile, downy, eyes open

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Today, a key factor in maintaining and increasing osprey numbers is the construction of osprey platforms. Our organization has been making nesting platforms since 1986. Originally we had just a handful of volunteers. Over the years we estimate that more than 100 different volunteers have helped with the project.

Osprey Facts
Mating: primarily monogamous
]Nest Style: trees and an infinite variety of man-made structures near water including nesting platforms designed for their use.

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Today scientists have more sophisticated means of tracking osprey than solely by the method of banding. Citizens United volunteers helped capture this Maurice River osprey, enabling the University of Minnesota and the NJ Endangered and Non-game Species Program to equip it with a solar-powered satellite transmitter.

Osprey Facts
Weight: 3.5 - 4 lbs.
Length: 22 inches
Wing Span: 54 inches