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A single Eastern Reef Heron subject Egretta gularis, dark form, a taxon rarely observed in Italy, can be observed regularly since the year 2003 within the Isonzo River - Mouth Nature Reserve (Gorizia - Italy). Data collected show that the dark plumage is advantageous in the capture of prey in shaded sites and that it is less attractive and threatening in relation to the other white Little Egrets.
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