Hi tweeters,

"I have wondered if it would be possible to train crows to pick up litter and
fly it to dumpsters in parks or near roads and reward them with food. They are
certainly capable and if the reward was large enough they would probably be
motivated to do so."

Looks as though someone is answering your question for you:

http://tywkiwdbi.blogspot.com/2008/08/training-crows-to-help-mankind.html

Cheers,

Seabird McKeon