Auks are sturdy seabirds that fly underwater as much as in air. The lost great auk adds a note of extinction, so the auk is read as something precious that could vanish if unprotected.
Has this come up in your dreams before? What was going on in your life then?
My Cosmic Code has a private dream journal. Write a dream down and the app picks out the symbols in it, shows what dream books say about them and, over time, which words recur across your entries. The journal is stored on your device only.