I'm sure glad that you guys have decided that petunias and zinnias are not boring
I think your bumble bees on the sunflowers are the drones (no stingers). The get booted out of the hive once their "job" is done, with no food & shelter.
They like the sunflowers because the flowers turn to follow the sun throughout the day. That keeps them warm.
Great job on the podcost. It's very interesting how the geographical locations really have a huge influence on one's Top 5 or 10 choices.