List of Birds of Connecticut - Osprey

Osprey

Order: Falconiformes Family: Pandionidae

The Osprey is a medium-large fish-eating bird of prey or raptor. It is widely distributed because it tolerates a wide variety of habitats, nesting in any location which is near a body of water and provides an adequate food supply. It is the only member of its family.

• Osprey, Pandion haliaetus — The distinctive black and white birds are common in the state from spring through fall; seen mostly on platforms on the east and central coastline; also called "fish hawks".
  • migrations are heaviest in early to mid-spring (around St. Patrick's Day) and late summer through early fall (around Labor Day), with most juveniles migrating a bit later.
  • feeds on medium-size fish, including flounders, which they catch by diving from the air, feet first; the birds are unique in Connecticut as the only species with a fish-only diet, and they are one of the few raptors that prey on live fish; they can be seen hovering over the water before splashing down, sometimes 2 or 3 feet in the water; the birds can catch up to 10 fish a day; adults feed their fledglings for up to 8 weeks; Ospreys have been known to snatch goldfish from ornamental fish ponds.
  • Formerly the bird was rare, in part due to pesticide contamination (including DDT), with just nine nests in the state as of 1974 and increasing to 162 (with 315 fledglings) by 1999; their range has expanded westward along the coast over time and up the Connecticut and Quinnipiac rivers; their nests stay intact through the winter, when the birds migrate as far as South America; in the 1990s, raccoon predation may have kept the population down at Great Island on the Connecticut River before barriers were put on the poles supporting nests; when racoons were more scarce, ospreys successfully nested on the ground, but they typically build nests at the highest possible locations, including cell phone towers.
  • In May 2008, the Maritime Aquarium at Norwalk set up a webcam of an osprey nest on Manressa Island, a peninsula on the west side of Norwalk Harbor, near a power plant. (A link to the webcam can be found at this Web page.) The tan color of the chicks makes them a bit difficult to see against the similarly colored nest on the black-and-white webcam feed. The aquarium monitors ospreys "because, as a predator, at the top of the food chain, osprey are an important indicator of the health of the entire ecosystem," according to the aquarium website.