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Because peregrine falcons don't build nests but lay their eggs on a flat surface, officials with the Port Authority of New York and New Jersey started protecting the eggs several years ago by building nesting boxes on the George Washington and the other bridges the authority operates.
WSJ: 4 falcon chicks living on NY-NJ bridge are banded
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Both recalls affect eggs packed in several different sized cartons, from a half-dozen to 18 eggs.
CNN: STORY HIGHLIGHTS
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To confirm that this is so, Ms Welch stripped the eggs out of several females (not as horrible a process as it sounds), divided each batch of eggs into two, and inseminated half with sperm from a long-calling male and half with sperm from a short-calling male.
ECONOMIST: Animal behaviour