45 years ago, Scrooge McDuck passed away at the age of 100. "But what about Duck Tales?" you ask. Well, so did Robyn Penacchia at Death+Taxes, who also had a few other questions:
To this day, I am still confused about the fact that, in this town of anthropomorphic ducks (Duckburg, duh), there were non-anthropomorphic ducks that the anthropomorphic Ducks sometimes fed at the park, with absolutely no acknowledgment that they were one and the same species, or that the other ducks were technically naked by anthropomorphic Duck standards.. I’m also pretty unclear about why the only other anthropomorphic species in Duckburg were dogs.
Following this and a few other leads, Penacchia came to the obvious conclusion: Scrooge was a vampire. While that seems like a statement we'd need Disney to comment on, there are other, truer facts here about the residents of Duckburg, their family, and what Donald does when he visits Europe. Link