PITTSBURGH (KDKA) — The Audubon Society of Western Pennsylvania says not to expect a third eaglet in the Hays bald eagle nest this year.

The Audubon Society reports that the adult eagles aren’t actively incubating the remaining unhatched egg, leading the Society to believe the egg is not viable and will never hatch.

According to the Audubon Society, a typical incubation period for a bald eagle egg is 35 days, and the remaining egg has now gone one week past that 35-day period. It is unknown why the egg will not hatch, but the Society says the egg may have been infertile or something went wrong within the egg after it was laid.

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The three eggs were all laid within days of each other in mid-February, and the first two eaglets hatched on March 21 and March 22.

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The Audubon Society says the two eaglets appear to be healthy. Last year, the Hays bald eagles laid three eggs. One cracked and neither of two remaining eggs hatched, possibly due to extreme cold temperatures. Three eaglets were successfully raised in 2014.

There is also an egg in the Harmar bald eagle nest, which the Audubon Society expects to hatch around April 13.