The corticosterone and behavioural responses of incubating penguins was measured on incubating adelie penguins in the 2001-2002 season. In the 2002-2003 seasons that study was extended to include non-incubating birds. Single penguins walking along the beach were herded into a corral and confined for 15 minutes. Behavioural observations of birds walking along the beach, confined in a corral or confined and exposed to a person standing 1 meter away were made for 10 minutes and then single blood samples were take from each bird 5 minutes later. Blood samples were analysed for corticosterone concentrations.