Hi everyone,
I'm new'ish to photography and want to give birding a try.
Currently I do mostly landscape/holiday/4wd shots, but have been getting frustrated when sitting around camp watching all the bird/animal life around me, and not being able to take the shots i want of them.

I have been using a 7d with a efs15-85 lens.

I'm going to start with the little wrens, robins, fantales etc we have in our backyard

From the reading i've done on ausphoto i have ordered a canon 100-400L, what i'm wondering is if i need any other gear to do a good job? eg a flash unit or extender

thanks kipp