Frederique Olivier / Large flock of Guanay cormorants (Phalacrocorax bougainvilli) flying to feed, Ballestas Islands, Peru.

Frederique Olivier / Large flock of Guanay cormorants (Phalacrocorax bougainvilli) flying to feed, Ballestas Islands, Peru.

Charlie Summers / King cormorants (Phalacrocorax atriceps) in courtship behaviour at their nest site. Saunders Island, Falkland Islands.

JIM CLARE / Nests of Guanay cormorants, (Phalacrocorax bougainvilliiorum) after breeding has finished, shows build-up of guano around the nest. The colonies are strictly protected and the guano will be harvested...

JIM CLARE / Nest of Guanay cormorants, (Phalacrocorax bougainvilliiorum), after breeding has finished, shows build-up of guano around the nest. The colonies are strictly protected and the guano will be harvested...

JIM CLARE / Balls formed in and around nests of guanay cormorants (Phalacrocorax bougainvilliiorum) as they walk over moist ground and coat loose stones, or even eggs, with guano. Each of the balls usually has a...

JIM CLARE / Nests of Guanay cormorants, (Phalacrocorax bougainvilliiorum), after breeding has finished, shows build-up of guano around the nest. The colonies are strictly protected and the guano will be harvested...

JIM CLARE / Nests of Guanay cormorants, (Phalacrocorax bougainvilliiorum), after breeding has finished, shows build-up of guano around the nest. The colonies are strictly protected and the guano will be harvested...

Alex Hyde / South Georgia shag (Leucocarbo georgianus) St. Andrews Bay, South Georgia. November.

Mary McDonald / Blue-eyed shag (Phalacrocorax atriceps) juvenile, Cooper Bay, South Georgia, South Atlantic.

Mike Read / Lichen covered rocks with Rockhopper penguin (Eudyptes chrysocome) and Imperial shag (Phalacrocorax atriceps albiventer) colony beyond Saunders Island, Falkland Islands, November.

Mike Read / Imperial shag (Phalacrocorax atriceps albiventer) adult on rocks with a beakful of nesting material, Sealion Island, Falkland Islands. December.