Green and Yellow
Not surprisingly, with all the flowers blooming, there are lots of bees about, from the humble but industrious bumble and carpenter bees to the flashy, green cuckoo wasp, they are all over both tree and weed. Mostly doing yeoman’s work pollinating flowers in their effort to collect their daily bread (so to speak), they add motion and even color to a static, if already colorful, scene.
I love bees.
[Update: this has been identified by the good people of BugGuide as genus Augochlorella. The yellow flowers are Barbarea vulgaris, which goes by various common names including yellow rocket and bittercress.]