A black vulture finding prey in a barn is unlikely in a species that hunts mainly by sight. We opened the door carefully and there on the thick straw on the floor lay two large eggs. We took several pictures and left it alone. The next day we confirmed that she was back on the nest.
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Black Vultures, Coragyps atratus, usually lay 1-3 eggs in cracks and caves along cliffs or in a stump or dense vegetation. There is no nest built, and the parents take turns incubating the eggs over 37-48 days. Once the eggs hatch, the young are fed by the parent's regurgitation. You would think this would encourage them to leave early but they don't take off for around 80 days.
Vultures defense against intruders is to vomit on them "with power and speed." Having retired from gastroenterology several years ago, I do not intend to intrude on them up close and personal. However we will cautiously take pictures at intervals.