Endangered herons find shelter at Park Ridge prairie

(POSTED: 7/6/10) Not far from the bustle of the Tri-State Tollway and O'Hare Airport, a pair of black-crowned night-herons have found sanctuary.
The birds -- relatively common in some parts of the country, but endangered in Illinois -- reside among the trees and other wildlife at Wildwood Nature Center's prairie in Park Ridge, a northwest suburb.
This type of heron has been visiting the prairie since at least 1996, said Wildwood supervisor Jenny Clauson.
"They arrive in early to middle May and nest for a couple of months until it's time to leave again," Clauson said.
The herons aren't usually seen together, she added. While one is protecting a nest, the other is away gathering food.
With a blackish back and a pale or gray underside, the herons are usually seen hunched over and relatively inactive.
"Sometimes when one sits high in the trees, it looks like a penguin," Clauson said.
Mature black-crowned night-herons look much different from younger ones, who have a brown and yellowish color, made to blend in with their scenery to protect themselves from predators.
Wildwood is proud the herons have chosen the prairie as their home.
Hillary Wells-Pranga, a naturalist at Wildwood, said the center is a good fit for the birds.
"Herons are always found around bodies of water, where they can find fish and frogs to eat," she said. "They like smaller lakes and bodies of water. The prairie has great water sources and food for them."
James Mountjoy, a biology professor at Knox College in Galesburg, described the herons as an uncommon summer resident.
"Most of the black-crowns in Illinois nest either in the Chicago region or in St. Clair County," Mountjoy said. The species used to be more common in Illinois, but with the decline in wetlands, the number has likewise slipped, he said.
Because of this, Mountjoy said, the birds are officially listed as an endangered breeding species in Illinois.
By Kayla Harris, for ChicagoWildlifeNews.com
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