Grasshopper grooming its antenna

This is the first grasshopper I found in my garden this summer and it is a big one. I was able to take lots of photos of it but this is the only one where the grasshopper is doing more than just posing. If you look closely you can see it is grooming its antenna by pinching it in its leg and pulling the antenna through the pinch point.

I have seen many different colours and sizes of grasshoppers but this is the first one that is just one colour.