WATCH: Penguins building nests at Shedd Aquarium

CHICAGO (WLS) -- It's another sign of spring! The penguins at Chicago's Shedd Aquarium have begun building their nests as mating season gets underway.

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As mating season begins at Shedd, sticks and rocks are provided to the rockhopper and Magellanic penguins to start the process of nest building

Shedd Aquarium/Brenna Hernandez

This week, trainers at the Shedd introduced sticks and stones necessary for nestbuilding into the rockhopper and Magellanic penguin habitat.

Over the next few weeks, the male birds will carefully select and arrange their nests to attract a female mate.

If they're successful, eggs could be seen by the end of April into May!