The Gibraltar Barbary macaques are considered by many to be the top tourist attraction in Gibraltar. The most popular troop is that of Queen's Gate at the Apes' Den, where people can get especially close to the monkeys.
Dry food items, especially foods that can be poured into specific portions, are often measured in grams. A gram is a measurement of weight or mass within the metric system and can be used to measure anything from cars to water.
The gram is a unit of mass, not weight. Weight is measured in newtons. Since a weight is a force, in the SI (International System) it is measured in newtons. You may be looking for the unit of mass (since people tend to confuse mass and weight); the SI unit of mass is the kilogram.