The grounding of a 20-metre-high iceberg near an emperor penguin colony has been linked to the deaths of thousands of chicks. Lead researcher Jeong-Hoon Kim from the Korea Polar Research Institute had conducted population surveys of the Coulman Island colony between 2017 and 2019 and said mass mortalities last season were "deeply upsetting". Advertisement Advertisement Advertisement"I still vividly remember watching adults return from foraging trips and regurgitate food for chicks begging to be fed," he told Yahoo News. Beyond the Coulman Island penguin colony, the iceberg cliff is visible on the horizon. Source: Myeongho SeoKim believes that underground topography and sea ice conditions could play an important role in iceberg behaviour.