This week's bird is a parasite - at least that's what its name implies. The dictionary tells us a parasite is something that lives off the work of other creatures and does nothing for them in return. In ancient Greece the term referred to a "professional dinner guest." Both these terms approach the reality of this animal.
Let's look at the scientific name - Stercorarius parasiticus. The first word means "having to do with dung." The second one recites the parasite theme. We're not climbing higher on the popularity scale, are we?