Well, it appears our decision to allow animals to live is based on a 'cuntishness' metricSo on that basis, probably ducks.
(
flatfrog Staring vacantly into space,
Sun 9 Jun 2013, 0:23,
archived)
geese, swans, humans are all above ducks
(
Rebel biscuit stercore sumus et nos esse novimus,
Sun 9 Jun 2013, 0:44,
archived)