Signs of Spring

Spotted today while seated at my desk:

• a bird gathering twigs to build a nest in a tree outside my window -- observed for about 20 minutes making multiple trips from ground where it collected materials in its beak up to its perch
  
• a Buff-tailed Bumblebee queen buzzing clumbsily around my window. According to the Bumblebee Conservation Trust, fertilized queens are often among the first bumble bees to appear in spring, searching out a suitable place to start the new colony. They are commonly seen in late February/early March after having hibernated in a hole in the ground or under moss for the winter.
  
• two of the many lady bugs who hibernated in our office this winter waking up and diving into coworkers' computer screens (they were escorted outside)