The bird's feet are grasping the window tightly.
The bird is standing on the window.
The bird is standing on the window by grasping the window tightly
exists e1 s1 x1 x2 x3.(n_window(x3) & n_foot(x2) & of(x2,x1) & n_bird(x1) & a_tightly(s1) & Manner(e1,s1) & Theme(e1,x3) & Actor(e1,x2) & v_grasp(e1))
exists e1 x1 x2.(n_window(x2) & n_bird(x1) & on(e1,x2) & Actor(e1,x1) & v_stand(e1))