A closeup of a hummingbird.
A hummingbird is feeding.
Hummingbirds do many other things which can be observed besides feeding.
exists x1 x2.(a_topic(x1) & of(x1,x2) & n_hummingbird(x2) & n_closeup(x1))
exists e1 x1.(Actor(e1,x1) & v_feed(e1) & n_hummingbird(x1))