Of all the herons I have seen, the great blue heron seems most prone to defending a large territory. The upper heron claimed an area encompassing most of the river in front of the location where I often film. Both shores. It had to meet all challenges or risk losing the entire hunting grounds. Snowy egrets and tricolor herons seem to have a territory not much larger than personal space while, with the great egrets I have seen, territory doesn't seem to be an issue at all.
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