The act of sitting on eggs to incubate them is called brooding.
For an osprey egg to develop normally, it must be exposed for a considerable length of time to temperatures a few degrees below the normal avian body temperature of 104 degrees. The incubation time of osprey eggs is 35 to 39 days.
Successful incubation requires a brood patch.
A what?
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About Harriett Raptor
Eight-year-old mother of five, fluent in telepathy, a possessor of genetic memory, a genius and scholar. Harriett holds the equivalent of a PhD in philosophy, biology, chemistry, physics, astronomy, and the Homo sapiens’ concept of the humanities. Her understanding of mathematics and logic are beyond Homo sapiens’ current comprehension. Harriett is a thinker, a wise osprey, especially distinguished for her expertise in the Homo sapiens problem.
Osprey Tales 
Can’t wait for answer to this one!!!
“Do you know about my brood patch?” Asked Harriett.