Not much is known about the social behaviour of Yellow-eyed penguins at sea. They return from fishing alone but does that mean they fish alone all day? In Ross Harbour at the north end of the Auckland Islands, groups of Yellow-eyed penguins appeared to be fishing cooperatively for small fish with White-fronted terns overhead diving down to get their share. The largest group sighted was 25 penguins. It was difficult to study this behaviour because as soon as our small run-about boat approached the activity they all stopped what they were doing and came over to have a look at us. Such curious birds!!