HUNTINGTON BEACH, Calif. -

People for the Ethical Treatment of Animals has apologized after graphic animal cruelty images were distributed to students at a Southern California elementary school.
   
The Daily News says parents at Calabash Charter Academy in Woodland Hills were outraged when PETA volunteers outside the school distributed comics with photo inserts of bulls being de-horned and an infected udder on a dairy cow.
   
The protest was organized in response to the school's bringing a cow to school as part of a lesson plan about dairy farming.
   
In a letter, the animal-rights group said the more graphic images were intended for parents, not students.
   
PETA said the volunteers made a mistake in distributing those materials to kids, but stopped short of apologizing for the protest.
   
PETA offered to distribute dairy-free ice cream sandwiches on campus as part of the mea culpa.