I think upto 400 million world people hunt, fish, collect vegetarian food from forest and have free food. Just my opinion. No confirmation.
42) More than 3.5 billion people depend on the ocean for their primary source of food. In 20 years, this number could double to 7 billion. http://www.savethesea.org/STS ocean_facts.htm
Bull elephants weigh 8 tons standing 12 feet tall and they eat 300 kg per day which is 3% of body weight. People also eat close to 2% - 3% of body weight per day. I bet there are tons of other species that as a whole eat far more than humans do. For example, there are 163,876,428,562 earthworms (source) in the world. Earthworms eat 1/3 of their body weight in a day. So they consume about 0.13 oz a day, for a total of 485 WTCs per year.