Piton check of lagoon Alberta 757-29 701-900 29901-30000 28 may Sterna hirundo The species are nesting in small colonies. The colonies are all in different stages of the nesting cycle. The colony across the lagoon has chicks and some eggs, the one by the tower eggs two weeks incubated, and the small colony near the tower is on fresh eggs. The one a large colony by the small new dug lagoon is on eggs 6-10 days incubated.