We have at least one young Great Blue Heron in residence. There is a large heron nesting ground north of Milwaukee in Ozaukee County, and we've usually seen one or two at Jackson Park each year for the last several years, which is always thrilling.
Within the last week, we've also observed both Black-Crowned Night Herons--a male and what may have been a female--and American Bitterns, three together one evening.
My guess is that the extremely dry weather has caused these birds to migrate from nearby wetlands where they normally live, to the spring-fed pond, which is home to plenteous frogs and insects, but is also stocked with small fish each spring.
Whatever the reason, it's very exciting to see these unusual specimins in a city park.
Great Blue Heron: http://www.fcps.edu/islandcreekes/ecology/great_blue_heron.htm
Black-Crowned Night Heron:
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