Frost, thrushes, hazelnuts

This morning was the first frost we've had since our arrival about a month ago. Two days ago, I started noticing thrushes singing: mistle thrush? song thrush? I haven't seen one. There's a big, beautiful hazelnut bush near the entrance here whose catkins have descended. Bright yellow Ulex are in bloom in the sandy fields behind the building here. Days are getting longer and everything is greening up.