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Colonies and land-based predators

Large,conspicious birds are hard pressed to conceal their nests so they tend to nest in groups to decrease the chances any individual nest will be predated (the bigger the colony, the smaller the chances your nest will be hit) and put their colonies in hard to reach places for land-based predators.  Mrs. Kelley is roosting (and possibly nesting) in the middle of a raging river above Niagara Falls.  Woe be to the predator that tries to swim out to that island! (and then make it back to shore if it eats chicks or eggs).  Looks like a protected place for nests. Good probability teaching point for elementary school teachers.