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Figure 9: <br />This nine week old chick had injuries consistent with those <br />inflicted by another heron. Like many bird species, sibling <br />aggression in Great Blue Herons is a well documented cause <br />of mortality (Mock 1985, Jakubas 2004). <br />Figure 10: Figure 11: <br />Among the contents of a Great Horned Owl nest were the This young Great Horned Owl, observed through a <br />remains of at least two Great Blue Heron chicks. spotting scope, had remains of Great Blue Heron <br />chicks scattered at its feet and beneath its perch. <br />10 <br />• <br />• <br />• <br />