Shedd Aquarium penguins begin annual nesting season

The penguins, whose nesting season is triggered by longer daylight hours, have mostly finished meticulously building their nests, using rocks, twigs and branches to form a tight circular nest. Some mating pairs have already laid eggs, and more will produce eggs in the coming month or so, a few of which may be fertilized and develop into baby penguins, said Lana Gonzalez, penguin and sea otter manager at the Shedd.