Smell
by the smell
Ants use smell to identify sweets even if they are kept in tins if there is any residue of the food on the outside of the container. When ants find food they send signals to other ants and they will come to the food source.
In your example, jar of sweets, is the collective noun; other collective nouns are a box of sweets, a tin of sweets, or a shop of sweets.
65
6
not as many as there used to be! i would say about 100