DD was really interested in them before she knew them, but once she learned them, she was ready to move on. Thats why (I am assuming) she has been through so many different "themes". Animal sounds from 6 weeks (yes weeks!)-10 months, farms/farm animals (when she was 11-13months), wild animals (14-17 months), underwater/ocean animals (18-20), and now space. Once she learns everything I have to offer, she seems to find a new "theme". It's really been interesting to watch and she gets totally consumed.

Did your kids do something like this? Or is this a bit odd? If they did, where did you get the info for them? I have just been buying books/ watching you tube with her and have learned a lot along with her while trying to show her new animals and explain things.
The things she has always been interested in and stayed interested in are numbers/letters/words/books.