(image from Wikipedia)
Wikipedia said that the Hummingbird Hawk-moths that are loving my plants are a good example of convergent evolution. Right on my balcony! Ever a sucker for new facts, I skipped to the info about convergent evolution and found that it "describes the acquisition of the same biological trait in unrelated lineages." They cited the example of an owl and a cat which are "distantly related predators that share keen, night-time binocular vision and targetable ears to help their night time hunting."
(both images from Wikipedia)
But back to the Hummingbird Hawk-moths and the hummingbirds. My tiny visitor is distinguished among moths for his rapid, sustained flying ability. In fact he is one of the fastest flying insects clocking in at 50km/h or 30m/h. He and his species hover in midair while they feed on nectar from flowers. Like hummingbirds, they are specialized nectarivores. Imagine!
Anyway, their hovering capability has evolved only three times in nectar feeders: in hummingbirds, certain bats and hawk moths (family: sphingidae). The hummingbird hawk-moth's hovering is similar to, but distinct from, that of hummingbirds. Both have long and mostly straight bills for their specialized nectar feeding and drink it with their trough-like tongues.
It seems the plants that are pollinated by hummingbirds or hummingbird hawk-moths produce flowers in shades of red, orange and bright pink. My geranium is an almost neon orangey-red so that's evidently why I'm seeing so many of these hawk-moths. It's okay with me, nature is an awesome teacher!