The first of six Humboldt penguin eggs has hatched at the Woodland Park Zoo. The first chick was discovered to have hatched on April Fool's Day. He weighs in at 2.1 ounces.

The eggs, six total in three nests, mark the first breeding and nesting season for the colony of 18 penguins since the exhibit opened last May.

The second egg in their nest shows pipping activity and is expected to hatch on Easter Sunday.

Humboldt penguin chicks hatch with grayish brown, downy feathers, which molt into completely gray feathers when they fledge. It will be early summer before any of the chicks emerge from the nesting burrows and venture outdoors into the public exhibit .

"This hatching is significant for the penguin Species Survival Plan," said Mark Myers, a Woodland Park Zoo curator who specializes in birds. "Humboldt penguins are an endangered species."