"Duo is an owl."
Translation:Duo bir baykuş.
yes. use -dIr (tur in this case) only if you are talking about a general fact, making an official/formal statement, encyclopedic knowledge or, ironically, if you are making a guess. So in general we don't use it a lot in the spoken language (except for really general facts like "kan kırmızıdır" (blood is red) which sound really weird when you just say "kan kırmızı") But in general not using it is better than using it all the time, if you want to make a choice :)