premise: A bird is perched on a line of some sort attached to a pole.
hypothesis: A bird is wallowing on a pole.
explanation_1: Being perched on a line is not the same as wallowing on a pole.
explanation_2: The bird is on a line attached to a pole, not on the pole itself. Sentence 1 doesn't indicate the attitude of the bird.
explanation_3: A bird perched on a line cannot wallow, because wallowing is a process done in dust or dirt.
premise_logic: exists e1 e2 x1 x2 x3 x4 x5.(on(e1,x2) & of(x2,x3) & to(e2,x5) & n_pole(x5) & Theme(e2,x4) & v_attach(e2) & (x3 = x4) & n_sort(x3) & n_line(x2) & Theme(e1,x1) & v_perch(e1) & n_bird(x1))
hypothesis_logic: exists e1 x1 x2.(on(e1,x2) & n_pole(x2) & Actor(e1,x1) & v_wallow(e1) & n_bird(x1))