It has been a fairly warm day today (7c) and when I got home from work this evening I found about three dozen dead bees in front of the hive and quite a lot more on the (mesh) floor of the hive. It is very cold at night (-4c) still. I think they are going out on cleansing flights and not making it back through whatever reason. I put a block of fondant in the top of the hive on sunday although the hive feels fairly heavy still. I have just had a very quick look under the roof through the holes in the crown board and there appears to still be a lot of activity. My question is this - is this amount of dead bees normal? and would the mouse guard be making it difficult for them to get back in the hive?