A Philosophical Question

Here it is:

If you had 1000 giraffes, 1,000,000 lions, 1000,000,000,000 ducks and infinity shrews and they were fighting to the death, last species wins, who would win?  The battle ground would be a 2 kilometer cubed field, clouds at the top and 1 small 2cm deep 1 foot wide river.  The time limit would be 16,9999 hours.


An interesting side note, 10,000 of the ducks have no beaks.