Population density in one location on a given specie isn't necessarily prove that they are thriving. The American Bald Eagle is everywhere in Alaska, too. You can even see a lot in Washington state but they are pretty thin around these parts.
The North American population of Great Blue Herons is estimated to be 124,500*. They suffered unrestricted hunting early in the 20th century for both food and plumage. They now have a stable population because they are protected.
*SOURCE: Audoban: http://web1.audubon.org/waterbirds/s...esCode=greblu1
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