Penguin

The penguin is an uncommon enemy that may appear in the Frozen Waters.

Description
Penguins are flightless aquatic birds. Highly adapted for life in the water, penguins have countershaded dark and white plumage, and their wings have evolved into flippers. Most penguins feed on krill, fish, squid and other forms of sea life caught while swimming underwater, resulting in them spending about half of their lives on land and half in the oceans. The penguins found in The Living Infinite appear to be a subspecies of the Macaroni Penguins.

Behavior
The penguin will try to get in the submarine by charging into it, but can be blocked by shields. Once inside, it will mindlessly chase and attack nearby crew members with its beak and wings, until it is killed. It is surprisingly fast and fairly resilient, and may pose a threat to unprepared crews.