In 2009, an estimated 62.1 million metric tons of eggs were produced worldwide from a total laying flock of approximately 6.4 billion hens. There are issues of regional variation in demand and expectation, as well as current debates concerning methods of mass production.
Olives are not toxic to cats, but have little nutritional value. Green olives and pimentos contain chemicals similar to those found in catnip, so some cats may be especially excited by olives.
Garlic and  onions can be toxic to cats and dogs because sulfoxides and  disulfides found in them can damage red blood cells and lead to  anemia. Onions are more problematic than garlic, but both should be  avoided.