Sometimes nature is cruel, but there is also a beauty in that cruelty.

The alligator, one of the ultimate predators, can fall victim to the 'teamwork' strategy that is possible due to the pack mentality and social structure of canines.

See the attached remarkable photograph, courtesy of Nature Magazine, but not if you're squeamish!

http://mars.walagata.com/w/bpcalgary/pack_dogs.jpg