Philippine Eagle Egg Larger Than a Goose Egg

It lays a single egg nearly the size of your fist.

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If the first egg fails early, a pair may attempt a replacement clutch.

The Philippine Eagle typically lays one large egg per breeding attempt. The egg can measure around 7 to 8 centimeters in length, comparable to or larger than many goose eggs. Producing such a large egg requires substantial parental energy investment. Because only one chick is raised, the entire reproductive effort centers on that single offspring. Incubation lasts roughly two months, demanding constant parental vigilance. In rainforest canopies exposed to storms, safeguarding the egg is a high-risk endeavor. The scale of investment underscores the species’ slow reproductive strategy.

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💥 Impact (click to read)

When a single egg represents the next generation, stakes are extreme. Predation, storm damage, or human disturbance can erase years of reproductive opportunity. Unlike birds that lay multiple eggs as insurance, this eagle commits fully to one heir. The biological gamble is enormous.

Such concentrated investment evolved in stable ecosystems where adult survival rates were high. Rapid environmental change disrupts that balance. If adult mortality rises, a low reproductive rate cannot compensate quickly. The Philippine Eagle’s large solitary egg symbolizes both evolutionary refinement and modern vulnerability.

Source

Philippine Eagle Foundation

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