Penguins are a group of birds that live almost in the southern hemisphere. There are 17 of penguins in the world, with the Emperor Penguin being the largest and the Little Blue Penguin being the smallest. Some penguins are able to temperatures as low as - 100 degrees Fahrenheit. Most penguins have that help them in the , icy climate such as waterproof feathers and extra of feathers. Penguins also have a special gland that them to drink salt water without the salt.