Bird Feeder<br>Karen bought a bird feeder. She put it out right away. No birds ever came around. One night Karen noticed a big cat running around. She realized it had killed all the birds that got near.
The big cat was not hers.
This was kinda tricky, but the text says she NOTICED a big cat running around. This implies she was surprised and did not see the cat before, meaning it not hers.
( z1 cat :polarity - :mod ( z2 big ) :poss ( z3 she ) )