sometimes with seaweed, feathers, shells or bones. Two or three olive-brown eggs with brown splotches are laid and the incubation period is about 30 days. Fledging takes place between November and January according to the location of the colony. References External links BirdLife Species Factsheet. Olrog's gull Birds of Argentina Southeastern South American coastal fauna Near threatened animals Near threatened biota of South America Olrog's gull Taxonomy articles created by Polbot