yellowbirdmom
Well, regarding the size of them, I just wonder if you don't see the smaller ones first then, after time, comes the big buggers. I say that because I had seen smaller ones before then huge ones, then small ones again, then tadpoles then bigger ones then huge ones again. I don't know, I haven't figured out how they die, babies first or what.
I noticed in the images file, there weren't very many pictures of flukes so I decided to record as many as I was able. If you look in the parasite main images file, under my user name, yellowbirdmom, you will see quite a few pics taken at different times.
It's good that you are teaching your son about parasites in people. Most folks just laugh it off when you talk with them, or get embarrassed and don't want to talk about it at all.
Carol