Blue-footed Booby and Chick Genovesa Sula granti (Tower Island)

Here is a newly hatched blue-footed booby chick in a nest marked by a white circle. The nesting boobies excreted this circle, an accumulation of guano, as they rotate to follow the sun during the incubation period. All blue-footed booby nests bear this white guano marking.

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