probably humans on helicopters. there aren't really any birds in Antarctica
On the continent, adult penguins have no natural predators, but chicks are vulnerable to carnivorous birds, such as Skua, that take the chicks to feed their own young. Penguins are sea birds and their natural predators are sea animals, such as seals and whales.
Orcas are apex predators and will eat penguins as part of their diverse diet. Penguins are a source of food for orcas, providing them with nutrients needed for survival. The hunting and consumption of penguins is a natural behavior for orcas in their ecosystem.
Penguins rely on their natural camouflage to blend in with their icy surroundings, making them less visible to predators like seals and orcas. They also use their agility and speed in the water to escape from dangerous situations. In some cases, penguins may form large groups, known as "rafts," to confuse and deter predators.
turtles
lepeord seals
fish
Leopard seals and killer whales are the main natural predators of adult Emperor penguins. On the other hand, chick mortality at many colonies is mainly due to the Southern Giant Petrel.
Penguins breed on Antarctica's beaches because there are no natural land predators there. Except for other breeding birds, such as skua, which can attack penguin checks and kill them in order to feed their own young.
the emperor penguin feed on small fish which feed on krill
No. Nocturnal activity is for most animals a way to avoid predators. Penguins don't have predators on land, so they rest at night.
Sperm Whale Also, Penguins will eat smaller squid.
To keep predators away