Great interaction. Looks like they are bickering over the rump. A bit hot in places on the birds and the grass stalk over Z's nose distracting. Still, an 8 as I understand the difficulties and nuances of true wild photography.
Looks as if they are dancing on his back -- great sense of movement here without the motion blur I might expect. Nice that the birds were against the dark trees -- sets them off so well. Lovely capture.