Beautiful Elsa
Yes, birds need a lot of speed, part of the reason I just went full-frame. Especially if you are trying to catch them in flight. Birds the size of the weavers you have here (the yellow ones) need 1/2000 or better...
Grant Atkinson once told me that the secret to bird photography was developing a list of places where you can get closer than normal, and techniques to make that possible otherwise...