Once while sitting on a Western Australian beach, I was very amused by the appearance of a few seagulls which looked like they were wearing a black toupee. It was also funny because they were having as bad a hair day as I was and were looking quite frazzled (WA is well known for becoming increasingly windy in the afternoon). It turns out that the ones with hair are not seagulls, they are a different kind of bird called a crested tern. Obviously both gulls and terns are quite happy to have each other as company. Also, if this photo is at all representative of these populations… seagulls are lazier and prefer to sit down.