Over the past few days I have been noticing that the bees in one of my 4 hives have started congregating on the landing board right in front of the opening. When we first set the hives up we noticed that this hive in particular seemed to be the weakest of the 4 nucs that we received. Is it possible that the bees have already outgrown the brood box in a month? This morning it seems that all 4 hives are doing this now but this weaker one seems to be the worst with about 50 bees sitting there. It is still early and I am thinking that it may have been like this overnight. The temperature here feels to be about 70 degrees. I have been concerned about signs of swarming that I am not familiar with and have even wondered if there has been some robbing going on at this one hive from the other hives. Do any of you here who have more experience at beekeeping have any thoughts or advice on this?