The bee starship isn’t yellow. Bees can see and appreciate hues, certainly, but do you own a car the color of your skin?
It’s not bulbous with a pointy end, either; it’s not a single mass at all. To describe it to someone with only one brain and two eyes, you’d call it a ghost ship, or a smoke ring. Or a dance.
And they’re not leaving for the reasons you suspect. They enjoy global warming, and the comforting buzz of cell phones; but they know when the blooming optical network will suddenly inflect. They don’t fancy having another hivemind around.