The Calgary Zoo is marking World Oceans Day in a very special way this year.

Zoo staff are celebrating the arrival of three Humboldt penguin chicks, who join 17 other Humboldt penguins in the colony.

The first chick hatched May 14 to parents Estaban and Karina. Two days later, the second chick hatched to parents Horatio and Sophie. And on May 31, parents Santiago and Juanita welcomed the colony’s third Humboldt baby.

“These spring chicks are a happy addition to our colony and for the Humboldt species,” zoo curator Malu Celli said in a news release.

“Humboldt penguins are listed as vulnerable according to the International Union for Conservation of Nature Red List and are part of the zoo’s Species Survival Plan.”