Posted by: Laura Lockard, Communications/Public Affairs I overheard a visitor at the Humboldt penguin exhibit express concern over a “sick” penguin. I looked at the penguin, “Oh my, he is having a bad hair day for certain.” I immediately allayed her concerns by stating, “He is just blowing his coat.” I then quickly realized that only a large-breed dog lover would know what that is. I couldn’t think of the bird version word for “blowing his coat.” Wracking my brain it finally came to me. Molting! He is molting. Penguin molting is a perfectly normal, annual event during which they replace all of their feathers. Penguins have more feathers than most other birds, with about 70 per square inch. Their feathers are stiff and overlap to waterproof and insulate their body. Molting can appear patchy as they lose a large number of feathers in a short period of time throughout the body, with old feathers falling out before replacement feathers grow in, a process known as catastrophic