1) Is it ever a good idea to have multiple hive entrances, not just one right at the bottom? I ask because I notice that, whenever there is a crack or hole in a hive where bees can fly out from, they seem to often prefer using that over go through right at the bottom.
2) Two of my hives have a lot of bees at the front, as show here:
Is this indicative of anything? Does it maybe indicate that they're looking to swarm? If I had a second entrance at the top maybe, would this possibly help with some sort of traffic congestion problem that might be happening here?
3) I built these hives myself and guessed the size needed for the hive entrance, as shown here:
Are these entrances possibly too small? I'm wondering if the size of these entrances could be leading to traffic congestion, or ventilation problems. I notice people talk about using entrance reducers in the winter, but I'm not sure if that's something that should be done where I live, in South Australia, which doesn't have cold winters, but gets very hot and it's almost always very dry and non-humid.
To expand on the ventilation, here's a picture of a lid I've got:
There's four of these holes on a lid, with a mesh barrier inside. Are these ventilation holes large enough? Some of my hives do sometimes have some moisture building up inside for whatever reason.