Suggestions for a bird ID video guide

Dear Fellow Birders,

I am creating a new series on my YouTube channel about identifying birds. I am aiming to show the differences between two species that are similar. Here is a sample video:

https://www.youtube.com/watch?v=mgVQ_Lep_HA

Since I started birding in Australia I thought I’d ask this list for any suggestions on more species that might be difficult to tell apart that could be good for such an ID list.

Thanks!
Sincerely,
Dr. Jason Polak