Why are birds an enemy of the penguin?

Birds are not an enemy of the penguin. In fact, penguins are birds themselves! They belong to the order Sphenisciformes, which is a group of flightless, aquatic birds.

While there are some predatory birds that might prey on penguin eggs or chicks (like skuas or gulls), penguins don't generally view other birds as enemies.

It's important to remember that penguins are just one type of bird, and like any other species, they have their own unique adaptations and relationships with other organisms in their environment.