@prefix log: <http://www.w3.org/2000/10/swap/log#>.
@prefix e: <http://eulersharp.sourceforge.net/2003/03swap/log-rules#>.
@prefix : <http://eulersharp.sourceforge.net/2006/02swap/steamroller#>.

:wolf_1 a :Wolf.
:fox_1 a :Fox.
:bird_1 a :Bird.
:snail_1 a :Snail.
:caterpillar_1 a :Caterpillar.
:grain_1 a :Grain.

{?X a :Wolf} => {?X a :Animal}.
{?X a :Fox} => {?X a :Animal}.
{?X a :Bird} => {?X a :Animal}.
{?X a :Snail} => {?X a :Animal}.
{?X a :Caterpillar} => {?X a :Animal}.
{?X a :Grain} => {?X a :Plant}.

{?X a :Caterpillar. ?Y a :Bird} => {?X :smaller ?Y}.
{?X a :Snail. ?Y a :Bird} => {?X :smaller ?Y}.
{?X a :Bird. ?Y a :Fox} => {?X :smaller ?Y}.
{?X a :Fox. ?Y a :Wolf} => {?X :smaller ?Y}.

{?X a :Wolf. ?Y a :Fox. ?X :eats ?Y} => false.
{?X a :Wolf. ?Y a :Grain. ?X :eats ?Y} => false.
{?X a :Bird. ?Y a :Snail. ?X :eats ?Y} => false.

{?X a :Bird. ?Y a :Caterpillar} => {?X :eats ?Y}.
{?X a :Snail} => {?X :eats [ a :Plant]}.
{?X a :Caterpillar} => {?X :eats [ a :Plant]}.
{?X a :Animal. ?Y a :Animal. ?Y :smaller ?X. ?U a :Plant. ?V a :Plant. ?Y :eats ?V} => ({?X :eats ?U} {?X :eats ?Y})!e:disjunction.