One of the main predators of Adélie penguins is the leopard seal (Hydrurga leptonyx). We don’t see many of these at Cape Bird as we don’t really have the right sea ice conditions at the time of year we’re there. So I only have one really bad photo taken from really far away on a day when the light was terrible.
But I do have some “nice” shots of a failed leopard seal attack. Failed in the sense that the leopard seal didn’t get lunch but the poor penguin didn’t survive and became dinner for some grateful skua.