We observed kleptoparasitism by a Ardea Herodias (Great Blue Heron) on a Nannopterum auritum (Double-crested Cormorant) at Harns Marsh, Fort Myers, FL. The cormorant surfaced with a large Oreochromis niloticus (Nile Tilapia) in its bill, and the heron immediately flew over and stole the fish from the cormorant. This is the first reported case of a Great Blue Heron kleptoparasitizing a Double-crested Cormorant and of a Great Blue Heron successfully engaging in kleptoparasitism of an animal sitting in deep water.
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Leys et al. (2024) studied this question.
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