I've been interested in all kinds of lists from about middle school age on. When I was a kid, several books of lists were published over several years. I think I read them all. This, combined with my love of nature and desire to know the names of everything around me, makes me an avid bird watcher and lister. I also have a Bryan Park list for the brids I've seen there.
Some people make a list of all the birds they see in the movies or in commercials.
I did that for a time. It gave me an excuse to go back and watch movies I hadn't seen in years. A No-life list is a list of extinct birds. Sadly, there are quite a few of these. The most famous is the Dodo.