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Alex Hatched From His Egg After 35 Days

After the egg is laid, the waiting begins. Gentoo penguin eggs take between 34 and 37 days to hatch.
After the egg is laid, the waiting begins. Gentoo penguin eggs take between 34 and 37 days to hatch. Photo: Rebecca Blackwell (AP)

Gentoo penguin eggs take between 34 and 37 days to hatch. Sánchez said that Alex was born on Dec. 2, 35 days after the egg was laid, and was a very strong baby. In early January, Alex measured eight inches (20 centimeters) in length and almost four pounds (1.7 kilograms), according to the aquarium. Adult gentoo penguins grow to an average height of about 30 inches (75 centimeters) and weigh about 11 pounds (roughly five kilograms). They can live between 15 to 20 years in the wild.

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