@emilyrose: You’re right. Vegans are people who do not eat any animal products including eggs, cheese, milk, yogurt and the like. This definitely means no fish or poultry. At best, the people who eat fish and poultry sometimes, but no red meat are simply people who don’t eat red meat.
@tiggersmom: While we are omnivorous, we can lose the enzymes that break down meat if we do not eat it for a while. The last time I had red meat, I was laid out on the couch for the whole day because I hadn’t eaten red meat in at least a year. It is a most unpleasant experience. Fish and poultry, however, are much easier on the system. :)