ah, then it's really true that they have such a bad vision?
When I pretty excitedly told Day of my very first encounter with a humming bird he got all worried and inquired "oh my god! Did it savage you?" Me, dumbfounded: "Attack me?! Come on, we're talking about a bonsai-bird feeding on nectar, not a Condor!" upon which he explained that they have pretty poor exesight and often accidentially fly against people wearing colourful clothing. Rumour has it that one once got stuck in the cleavage of a lady wearing a dress with a flower print. (Must have been highly uncomfortable for both parties involved...)