This is a welcome sight! The flowers are opening and with this action, we should be seeing Andrenid bees swarming the flowers for the pollen. However, with the colder weather coming for the rest of the week, the bees will likely stay hidden until it warms up again. They certainly don't need really warm weather and I've seen them out when there is still snow on the ground and the air temperature about +6. But freezing rain and below freezing temperatures are something else. Anyway, something to look for!
It is astonishing how fast these willows burst into bloom. I checked them out on Saturday and saw only the soft grey catkins. Jeewanthi was there today, Monday, and took this shot. What a difference a day makes!