Imperial shag (Phalacrocorax atriceps) arriving at a breeding colony with plant material in its beak for building a nest. Such breeding colonies may contain hundreds or even thousands of other birds. This shag pairs with a single partner, and builds a nest made of seaweed and grass. This seabird is a type of cormorant, and is found in the regions around Antarctica, feeding on fish and invertebrates. Photographed on the Falkland Islands.