Humboldt Penguins are one of the two species introduced in version 1.6.4o.
In the wild, Humboldt Penguins behave like other animals. They only spawn in the ocean biome. When attacked, all other Humboldt Penguins around will get mad and attack you. Their call lengths vary based on their health.
When right-clicking any Humboldt Penguin with a raw fish, there is a 1/3 chance it will be tamed, even if it is angry. Tamed penguins wear red bow ties. You can shear a tamed Humboldt Penguin by right-clicking it with shears in your hand. There is a 66% chance it will drop brown striped or white Penguin Feathers, but a 33% chance it will become angry and attack; however, other penguins will not attack you in this situation. Note that tame penguins can be bred with wheat.
Humboldt Penguins will drop 0-2 brown Penguin Skins on death.