Bees flying in Spring

How lovely it was to see the bees flying in the sunshine earlier this week. I saw them bring in pollen which is a sure sign of brood and hence that there must be a laying queen in there somewhere but its still too cold to open up the hive.  The pollen I say was * a grey/white colour that is probably from the early blossom of wild plum trees

* a bright yellow that probably means that some of the willows are beginning to flower