Training Session by Stefan Christmann (Germany) When Christmann came across this penguin couple in Atka Bay, Antarctica, seemingly with an egg, he was surprised as it was too early in the season for egg-laying. Upon closer inspection he discovered the egg was in fact a snowball! Perhaps the diligent couple were practising the egg-transfer skills in preparation for when their real egg arrived. This is possibly the first time this phenomenon has ever been witnessed and documented

Photograph: Stefan Christmann/2019 Wildlife Photographer of the Year