Uni M bought me an ant farm (she knows the way to my heart) just one small problem; no ants. Luckily I found some in the garden and enticed them into the farm with honey, stuck the lid on and waiting for them to start building tunnels.
When I came back later, they were all gone. I couldn't see how they had escaped so I put some more in and watched to see what would happen. The weak link in the set up? Air holes!