Are penguins birds?

Yes, penguins are birds in that they have feathers, lay eggs and have forelimbs modified as wings, but in this case used for swimming. They also share all the other characteristics of birds, being warm-blooded (around 40 deg C) and having a reduced reproductive system (one functional ovary or testis).

Yes, penguins are birds. They have wings, lay eggs and have rudimentary wings. They may not be able to fly in the sky, like most birds, but they can certainly fly in the water.

Yes penguins are definitely birds, very handsome birds as a matter of fact.

They might not fly very well but penguins are most definitely birds.

Penguins are birds. Even if they do not fly they are stil birds

Yes. Penquins are a group of flightless, aquatic birds.