For girls too. This is a very “natural’ looking bird feeder
You do need to use a drill so use judgement on ages. I do have a simpler make your own bird feeder craft using pine cones which is great for younger kids or if you want something easier.
From one of my favorite sites, Instructables
The full instructions and building material can be found on the excellent tutorial for making this suet bird feeder.
I am not especially handy and can handle this job easily.
I love this site!