Do Birds have a sense of smell?

I spotted a bird in our stockroom the other day. I tried to keep track of it but it took off overhead into another part of the stockroom. This posed a few questions. How did it get in? Can it find its way out? Will it set off the overnight alarms? And do birds have a sense of smell? We keep a small selection of food in the stockroom and were worried that the bird would peck its way into these items. Of course birds have an excellent sense of sight for seeking food from the skies, but then they only have a beak which is visible to the naked eye. Would it recognise and smell these boxes out? It turns out not. A few hours later, I saw a bird on the stairwell. Again, it reacted before I could and flew up into the rafters. I got a colleague and pointed out its escape route, but could just see shadows. We got a light which immediately illuminated the bird, which took off round the other side of the wall. It turns out that there's a gap between the inner wall of our building and the outer wall of the retail complex, allowing the bird to shop from store to store. Happy shopping little birdie.