Hello, this is my first time raising two little ducklings named Daisy and Daffy. Daisy is a white pekin, and Daffy is SUPPOSED to be a black runner... however, I don't think that s/he is. http://imgur.com/8Q1SJe2 Now Daisy is the one who this post is about... the first week I got her I noticed this little poof on her head. http://imgur.com/IOX4eq7 http://imgur.com/fL0lxYg http://imgur.com/WpdhV85 Should I be concerned? Thanks in advance!